Saturday, August 4, 2018

Ruby-throated Hummingbird

This female Ruby-throated Hummingbird perched on our hummingbird feeder during a rainstorm on 1 August 2018. She held her bill skyward and appeared to have her eye closed. Perhaps she was resting in these cool, wet conditions. Hummingbirds are able to generate heat via their hovering. Females are more efficient heat generators than males. During really cold weather, Ruby-throated Hummingbirds become torpid (Weidensaul et al. 2013). I doubt, however, that conditions were sufficiently stressful for torpor on this day.

No comments:

Post a Comment