Wednesday, August 16, 2017

Eastern Kingbird

The local Eastern Kingbirds have brought off this year’s clutches. This first photo was taken on 7 August 2017, in Rice County in the Carleton College arboretum. This young bird seems to be contemplating its upcoming journey to South America. The second photo is of a recently arrived kingbird taken last May in the county. I have been experimenting with a new photo development program, Topaz Studio. I am pleased with the results. The app replaces Adobe Photoshop. If for no other reason, it is worth trying because the basic program is free.

Tuesday, August 15, 2017

Proboscis Bat

More bats in the Villa Lapas belfry. Proboscis Bats live in groups of up to 10, sometimes more. They have regular feeding areas, preferring small ponds like where we searched for dragonflies and frogs. They form harems and breed all year. These bats are found from northern South America north to southeastern Mexico.

Monday, August 14, 2017

Tent-making Bat

On 2 July 2017 alongside the Frog Ponds at the Villa Lapas eco-lodge in western Costa Rica, we found a Tent-making Bat hanging in a garden bush, These bats make their own abodes. The bats chew the ribs and veins of plants until the leaves fold over, creating a tent. On the plus side, this behavior means that the bats do not have to search for shelter in caves (which can be uncommon in the jungle) or other cavities in trees or in buildings. The disadvantage is that the leaves wither and die, and the bats have to make new tents every couple of weeks. One consequence is that Tent-making Bats tend to be more nomadic than more typical bats. (Wikipedia).

Look in the bat’s ears. The shiny, brown structure in each ear is not an eye, but a tragus. The tragus is a fleshy structure that aids bats in echolocation. The tragus collects sound from behind the bat. The result is that a bat has enhanced perception of its surroundings. The black eyes are further down the head nearer to the bat’s nose.

Sunday, August 13, 2017

Hourglass Frog

Hourglass Treefrogs, or Dendropsophus ebraccatus, are tiny, yellow frogs. They are Central American amphibians and are tolerant of ecological disturbance. They differ from other frogs (and, perhaps, all other vertebrates)—they can lay their eggs in the water or on land. If little shade exists, they go for the water. With shade, they lay their eggs on land. When in the water, the tadpoles are eaten by dragonfly nymphs. To escape the dragonflies, the frog larvae can change their tail color (Wikipedia).

Saturday, August 12, 2017

Red-eyed Tree Frog

One of the many highlights of our Costa Rican tour were the small, artificial ponds at the Villa Lapas eco-lodge. We visited both during the day and at night. I hoped we would see Red-eyed Tree Frogs. They are often used as icons for rainforest preservation. They are found from Mexico to Colombia. You can find them on both slopes of Costa Rica. Frogs from the Pacific Coast have yellowish sides. Those from the Caribbean side, like the one in the second photo, sport blue sides.
These frogs flash their red eyes to startle predators. The frogs are not poisonous, They depend on their green backs for camouflage. Mating Red-eyed Tree Frogs call during the rainy season and also shake branches to attract their mates.
During amplexus, like in the third photo, the female carries the male on her back, sometimes for several hours, as she lays her eggs. The female glues her eggs on pond leaves (Wikipedia). Finally, the last photo is of frog eggs laid in such a manner. No guarantee, however, that these belong to Red-eyed Tree Frogs.

Friday, August 11, 2017

Carmine Skimmer

Dennis Paulson was disappointed in the relative lack of dragonfly habitat at the Villa Lapas eco-lodge. Enough species, however, flitted about to keep us entertained. This Carmine Slimmer defended a small puddle in a roadside tire track. The dragonfly zipped back and forth, making photography nearly impossible. The species is known to be an aggressive defender of its territory, which can be up to 30 feet long (Paulson).

“You know,” said Dennis, “we could provide it with a perch.” Dennis stuck a stick into the mud. Within a minute, the skimmer landed in front of us.  Carmine Skimmers range into south Texas, where their range is rapidly expanding. A couple of Arizona records also exist. This species ranges south to Argentina.

Thursday, August 10, 2017

Bare-throated Tiger-Heron


After watching the kingfisher of the last post, Erika turned on the Villa Lapas bridge and explained, “That looks like a Tiger-Heron!” A Bare-throated Tiger-Heron to be exact. You can see that the heron’s throat is not feathered. This tiger-heron is the only one with a bare throat.

We encountered Bare-throated Tiger-Herons throughout our Costa Rica trip. They were especially common in the one mangrove swamp we visited. I found their plumage to be remarkably variable. This individual seemed remarkably strikingly plumaged.

Tiger-Herons eat fish, frogs, crustaceans and insects, probably whatever they can catch. Although we saw them during the day, the species by nature is crepuscular or nocturnal. Bare-throated Tiger-Herons are found from the Mexican lowlands south through Central America to northernmost South America. Apparently there is one record from southern Texas (Handbook of Birds of the World).

Wednesday, August 9, 2017

Ringed Kingfisher

A river runs through the grounds of the Villa Lapas eco-lodge. A tall, wide bridge connects two sides of the hotel accommodations.  Here, on 2 July 2017, perched one of our first birds at the lodge. A Ringed Kingfisher patiently watched for fish. At first the bird was hard to identify—it faced away from us. Only when the bird turned sideways could we see this bird’s massive bill. In the last 40 years, Ringed Kingfishers have expanded their range into Texas. Usually they are found from the Mexican lowlands, through Central America, and south across much of South America.

Unlike Belted Kingfishers, Ringed Kingfishers seldom hover before plunging for their prey. Instead they sit patiently, sometimes for hours. They mostly consume fish. On the other hand, like our Belted, Ringed Kingfishers depend on high, dirt banks in which to excavate their nests. The absence of such landmarks can limit these birds’ occurrence (The Birds of North America).

Tuesday, August 8, 2017

Villa Lapas

We spent the next three nights near the Pacific Coast of central Costa Rica at Villa Lapas. This eco-lodge is a cluster of cabins in the rain forest adjacent to Carara National Park. The forest here is the northernmost extension of the Pacific rainforest remaining in Costa Rica. The rooms are comfortable, despite the forest attempting to colonize the cabin roofs. The cabins were air-conditioned. Not that I am complaining, but air-conditioning caused our camera equipment to fog over for a half-hour as we emerged every morning. I am sitting on our porch waiting for my lenses to clear.
The grounds were gorgeous, and full of birdlife. A clear stream—at least until a night of torrential rains— runs through the grounds, and the hotel maintains a couple of small pools, ideal for searching for frogs and dragonflies. Dennis was disappointed that previous floods had taken out other pools. Overall, we felt that the hotel offered a good introduction to Costa Rican dragonflies and birds. The nearby National Park allowed us to venture deep into the jungle. Lapas, by the way, is a word for macaw. We saw Scarlet Macaws every day.

Monday, August 7, 2017

Dusky Dasher

On the far side of the Rio Tarcoles bridge, on 2 July 2017, we found a female Dusky Dasher (Micrathyria schumanni). This species is found from Mexico south to Venezuela, and not in the United States. We got excited because our fearless leader, Dennis Paulson, did not immediately provide us with a name. After our return home, Dennis researched and concluded that this dasher is the only one whose females have an almost pain, brown abdomens.

Sunday, August 6, 2017

Square-spotted Dasher

Despite the Tourist Police attempts to keep our being devoured by crocodiles on the Rio Tarcoles bridge (Puntarenas, Costa Rica), we managed to photograph a few dragonflies. The first is a Square-spotted Dasher (Micrathyria ocellata). This species ranges from central Mexico well into northern South America. I am aware of no records from the United States.

This dragonfly has no common name. Our intrepid guide and soon to be author of the Dragonflies of Costa Rica, suggests the name Square-spotted Dasher. Note, however, that English or Spanish names for Costa Rican dragonflies and damselflies found outside the United States are not officially sanctioned by anyone.

Saturday, August 5, 2017

American Crocodile

Our second stop on 2 July during our Costa Rica dragonfly tour was one I shall not soon forget. The highway (Route 34) crosses the Rio Tarcoles. The bridge is two-laned, with heavy traffic. Sidewalks, basically only wide enough for one person, run on both sides of the bridge. Tourist activity abounds. To think that this experience was free of charge! We parked and walked across where we rejoined our bus. We wondered what attracts the crocodiles. Undoubtedly they are fed. Pedestrian fatalities? Dragonfly hunters who venture down the river banks? We were scolded by tourist police when we tried to search for dragonflies.

American Crocodiles have “catholic diets” (Scientific American Blogs). They are tolerant of salt water, which has allowed them to inhabit many areas of the Caribbean. They range from northern South America up both coasts of Central America and Mexico. They are also found in Florida. The bump on their slender snout in front of their eyes is distinctive. Modern crocodiles grow up to 4 meters in length. Old records exist of animals almost twice that long.

Friday, August 4, 2017

Brilliant Blue Skipper

Several of our companions on our Costa Rican dragonfly tour knew their butterflies. This butterfly is a Brilliant Blue Skipper, Paches loxus. I knew North American skippers tend to be black and brown and difficult to identify. We saw several species of azure skippers during our trip. Surprisingly the Brilliant Blue Skipper appears to have little Internet presence, aside from a few photographs and specimens. Thus, I can’t tell you much about it. Perhaps a butterfly expert would care to comment.

Thursday, August 3, 2017

Lineated Woodpecker

While we watched the grassquit of my previous post, Erika heard a woodpecker drumming. She spied the bird working in a distant, large tree. Lineated Woodpeckers are common from the Mexican lowlands south across much of northern South America. This large woodpecker inhabits both humid and moderately dry forests. It prefers open woodland near clearings and forest edges, and even big trees in pastures or gardens

Lineated Woodpeckers eat a wide variety of wood-boring arthropods. They also take fruits, seeds, ants and other arthropods. They feed at all levels of the forest, including on the ground. They may feed at one location for 15 minutes before flying long distances to new feeding areas. They tend to be wary (Handbook of Birds of the World).

Wednesday, August 2, 2017

Blue-black Grassquit

Blue-black Grassquits fed on the Calle Loro roadside weeds as we came out from our dragonfly creek. This photo is of a female. Their streaky flanks are good field marks. Central American males are black. Some controversy exists on just how to classify grassquits. I thought they are small sparrows. The Handbook of Birds of the World considers them to be tanagers.

Grassquits are common from Mexico south across much of South America. Blue-black grassquits are found in weedy fields and roadsides. They  eat seeds and a few insects or berries. The forage on the ground or from weed-tops. They often form large flocks.

Tuesday, August 1, 2017

Black-winged Dragonet

Back up from the creek, we found a Black-winged Dragonlet along the Calle Loro roadside. This species is an uncommon stray into the south-central United States. Its main range is from Mexico and Central America south to Colombia and Ecuador. Adult Black-winged Dragonlets aestivate during the dry season. With the rains, they move from forests to open ponds (Odonata Central).

Monday, July 31, 2017

Esther’s Threadtail

Esther’s Threadtails are tiny, but beautiful damselflies that live in southern Central America and northern South America. Males hover over quiet streams. Finding dragonflies that someone else spotted was often challenging. “Its on the leaf over the rock,” was all fine and good—except if the stream is strewn with rocks. Our guides used laser pointers to indicate the approximate location of our quarry. The guides, gentle readers, were careful not to directly point a laser beam at an individual animal.

Sunday, July 30, 2017

Fiery-eyed Dancer

Fiery-eyed Dancers flitted about the Calle Loros stream, landing on rocks and on stream-side vegetation. They are a neotropical damselfly, ranging from Colombia, north through Central America and Mexico into Arizona, with a few records in New Mexico and Texas. They prefer shallow, rocky streams. Erika and I were awestruck with their beauty, portending exciting dragonflies to come in our Costa Rican adventure. 

Saturday, July 29, 2017

Smoky Rubyspot

Arriving at the small stream along Calle Loros in Alajuela Province, Costa Rica, we found our first Odonata. Several Smoky Rubyspots perched along the stream. I was aware of this damselfly, even through it was new to me. It ranges across Mexico and Central America into the southeastern United States, north to northern Illinois, southern Wisconsin, and Iowa. In the United States, males perch along shady pools. Females are not found near water unless they are mating. Our Costa Rican Smoky Rubyspots appeared to behave in the same way.

Friday, July 28, 2017

Gartered Trogon

On the morning of 2 July, we piled into our bus and headed towards the Pacific Coast southwest of San Jose. Along the way we stopped at a small woodland. We walked along a muddy track to a stream, where we searched for dragonflies. Slipping and sliding along the path, we spied a Gartered Trogon.

The key to identifying a Gartered Trogon are their yellow eye-rings. Trogons are pan-tropical species, found across many of the world’s tropical regions. The birds tend to sit still in woodlands. They eat arthropods and fruit. Gartered Trogons used to be classified as a race of the Violaceous Trogon, but that bird was split into three separate species. Note that not all ornithologists agree with this classification. Nonetheless, Gartered Trogons are fund from central Mexico, south through Central America, to northern South America.

Thursday, July 27, 2017

Variegated Squirrel

Variegated Squirrels (Sciurus variegatoides) ran about the trees in the Bougainvillea Hotel garden. These callico-colored squirrels are found across much of Central America. They are diurnal, tree-dwelling squirrels that seldom venture onto the ground. They eat seeds, fruit, and insects. They do not hoard food, thus do not disseminate seeds like other squirrels.

Captive Variegated Squirrels brought to Europe have harbored bornaviruses, which cause numerous and sometimes fatal neurological disorders in humans and other mammals. These viruses have a world-wide distribution, but it is not known if the European animals became infected in Europe or brought the viruses with them from Central America (Wikipedia).

Wednesday, July 26, 2017

Red-billed Pigeon

Red-billed Pigeons are found from the Rio Grande Valley in south Texas, south through Central America to Panama. These pigeons appeared to be common throughout our travels in northern Costa Rica. We found them in the Hotel Bougainvillea gardens on 2 July. These pigeons feed on various berries and other fruits. Throughout their range, however, populations appear to be declining.

Our tour routine quickly became established. Alarm at 5 AM. Bird walk from 6 to 7. Breakfast 7 to 8. Traveling and stopping at dragonfly spots until noonish. Quick lunch. More traveling and dragonflying. Supper at 7. Night stroll searching for frogs after supper. Downloading photographs from camera to computer. Exhaustion. One consequence of this schedule is that bird and dragonfly photos are somewhat clustered—we were either seeing dragonflies or birds.

Tuesday, July 25, 2017

Rufous-naped Wren


I think that when I wrote, “we birded in the garden in the back of the Bougainvillea Hotel,” that you do not have an appropriate vision of how luxuriant it was. In the 30 minutes we had on our first evening between rain showers and an hour on Sunday morning, we saw six bird species—and 16 the next morning. 

One interesting bird was the Rufous-naped Wren. This species often nests near wasps, which provide the nesting birds with protection against predators. Rufous-naped Wrens are found from southern Mexico to northern Costa Rica. Compared with more northern populations, the Costa Rican birds are hardly marked below and have the rufous on their napes extending onto their backs. Their calls also differ. Many ornithologists now consider them to be a separate species, the Rufous-backed Wren. In any event, this bird was common in most of the northwestern Costa Rican locals we visited.

Monday, July 24, 2017

Clay-colored Thrush

Our first Costa Rican bird was this Clay-colored Thrush in the garden of our first hotel, The Bougainvillea on the outskirts of San Jose. We arrived late, after our airport ordeals. Many of our companions were surprised that this thrush, despite all the stunning birds of the country, is the National Bird of Costa Rica.

This thrush is found from the Rio Grande Valley south through Central America to northern South America. The males’ songs are like those of American Robins, but “smoother, clearer, mellower, and more melodious” (Handbook of Birds of the World—Alive). In Costa Rica, Clay-colored Thrushes are commonly kept as cage-birds, despite their being the National Bird.

Sunday, July 23, 2017

Costa Rica

We visited our kids in Texas on our way to Costa Rica. Many of you know that we hate airplanes. Flying from Dallas, at least, allowed us a nonstop flight. We spent the first 18 days of July with a tour under the auspices of Sunrise Birding, led by Dennis Paulson, one of the world's foremost dragonfly experts, and Steve Bird, a tour guide with awesome bird identification skills. 

This tour was a first for us. We enjoyed being tour clients. No worries about itineraries, reservations, or navigating Costa Rican highways. The tour focused on dragonflies, which meant arriving during the rainy season, the best time for Odonata. But to our delight, we also chased birds and anything else we could discover. Posting my photos from the tour will take many months. I will interrupt my report with local observations.

Flying to Costa Rica did not cure our fear of flying. Thunderstorms in Dallas forced us to fly over Louisiana, before we turned south. Much of Central America lost power as we tried to land in San Jose. We made an aborted landing to avoid a plane on our runway. All the computers in the airport were inoperative, leaving a line of about 1000 people in front of us. Matters could only improve, which they definitely did, beginning with our being met by a patient Steve Bird when we finally escaped customs.

Saturday, July 22, 2017

Texas Odes

On 30 June, we explored a small, artificial pond in Denton County just north of Dallas, Texas. Like our photos from Kansas two days earlier, all were well known to us in Northfield, Minnesota. I was excited when I found the first dragonfly. It was flying about thorny bushes fairly distant from water. But, instead of something exotic, it proves to be a female Blue Dasher.
The second is a male Widow Skimmer. Except the Rocky Mountain west, these dragonflies are common across much of North America. The second photo is of a female Eastern Pondhawk, abundant across most of eastern North America. (We also saw an Eastern Amberwing, like the one from Kansas in my last post.)

Friday, July 21, 2017

Kansas Odonata

Our adventures last June began with a quick trip to visit kids in Dallas. Texas in the summer heat may not appeal to all, but I looked forward to seeing a few new dragonflies. Our first afternoon was in Andover, Kansas. We stayed at a Holiday Inn Express that boasts a small duck pond. We found a number of dragonflies. Unfortunately, none was new. The first photo is of a male Eastern Amberwing.
Flying over the pond was a Prince Baskettail. Hard to photograph, but occasionally seen in Northfield.
This third photo is a Blue Dasher, abundant in many parts of the country.

This last damselfly is probably a Skimming Bluet. Note the lack of blue rings on the abdomen. The lily pads upon which it perched is also typical habitat for this species. (Thanks to Scott King for help identifying this one.)

Wednesday, July 19, 2017

Scissor-tailed Flycatcher

We have been away from the Internet for the past three weeks. Our adventures began with a quick trip to Dallas to visit grandchildren. My target bird for this first leg of our journey was the Scissor-tailed Flycatcher. I lacked a good photo in my collection and also missed seeing a vagrant flycatcher in Minnesota in June. These flycatchers are common in Texas and the southern Great Plains, They specialize in eating grasshoppers and beetles. Individual tail length is variable, although males generally have longer ones. 

Monday, July 3, 2017

Four-spotted Skimmer

Four-spotted Skimmers are found across Canada and the northern United States (further south in the West). They also inhabit Europe and Asia, where they are known as Four-spotted Chasers. I caught this individual backlit in Erika’s garden on 8 June 2017. Some populations are migratory, and can be found in large aggregations. The prey upon other dragonflies, even those of similar size (Odonata Central).

Friday, June 30, 2017

Blue Dasher

Our first Blue Dasher of the year, 24 June 2017, in Erika’s garden. Blue Dashers are often abundant across most of the United States. Only Montana and Wyoming lack records in Odonata Central. They perch with their wings slanted downward from treetops to almost ground level. They often return to their perches, making photography somewhat easier. 

Blue Dashers are fierce predators. They take over 10% of their body weight in prey every day. They are aggressive towards competing males, often raising their blue tails at them. Females lay up to 700 eggs in only 35 seconds. Odonata Central, from whom most of this information is gleaned, maintains that Blue Dashers are largest in the spring, and get progressively smaller in the summer and fall. I thought, however, that this one seemed relatively small as it was.

Tuesday, June 27, 2017

Eastern Forktail

I agree with Scott King, who once mentioned that Eastern Forktails, were they not so common, would be a highly sought after damselfly. Sort of the Blue Jay (actually a quite handsome bird) of the dragonfly world. Males have bright emerald bodies and azure-tipped tails. Most adult females are a lovely shade of blue. Immature females sport a bright cinnamon color. I took these photos on 2 June 2017 in the Dakota County Lebanon Hills Regional Park.

Saturday, June 24, 2017

Red-eyed Vireo

The Red-eyed Vireo’s persistent, clear whistle is often heard in North American forests. The song seems to ask a short question and then give a short answer. A folk name is Preacher Bird. One observer commented, “I have always thought that whoever dubbed this vireo the ‘preacher' could have had no very exalted opinion of the clergy” (Bradford Torrey in Bent 1950).

The word vireo comes from the Latin “greenfinch.” Most vireos are greenish birds (Gruson 1972). Whatever the name, this photo clearly shows this vireo’s red eye. Erika and I found this bird in Carleton College’s arboretum in May 2017. This species breeds across much of Canada and the United States. They winter east of the Andes in the Amazon jungle. When migrating, this bird orients to the earth’s magnetic field (Cimprich et al. 2000).

Thursday, June 22, 2017

Eastern Pondhawk

Eastern Pondhawks are abundant across much of eastern North America. This one is from Erika’s garden yesterday. I think this is a young pondhawk. Adult males will become all blue. The tail is just changing—a rather regal image in my opinion. Pondhawks are fierce predators. Several have been zipping around the garden this spring.