Great Blue Herons were common during our 20 September 2016 hike in the Nisqually National Wildlife Refuge. Although we had just seen one take a frog, thier main prey is fish. Other amphibians, reptiles, birds, and mammals are also taken. They occasionally scavenge carrion.
This heron is showing typical hunting technique—waiting and ambushing prey. Other strategies are reported, including using bread crumbs as fish-bait. Great Blue Herons are found in a number of habitats, both in and near fresh and salt water. They can also hunt on dry land. Consequently it is one of the most common of the North American herons and egrets (Vennesland and Butler 2011).