@EZLorenzImagery Beautiful #footage of an #Anna's #hummingbird #Calypte #anna #mother feeding her #young. It is well visible that she uses her position at the edge of her nest also to #warm her #offspring. Due to their relation between body mass and body surface, there is not much #warmth #energy persisting, when these birds don't move. Thus C. Anna needs to move a lot to produce warmth. And it can move very fast: Relative to their #bodysize, it is considered one of the fastest vertebrates.