How the World's Smallest Birds Survive the Winter...
Hummingbirds are tiny dynamos that expend so much... ...es enter into an "energy-conservation mode called torpor ," according to Oregon State ecologist Adam Hadley... ...lummet to 48 degrees.Heart rates also slow during torpor : The blue-throated hummingbird’s heart rate... ...28-degree day.In fact, hum...
https://www.neatorama.com/2017/01/09/How-the-Worlds-Smallest-Birds-Survive-the-Winter/
