Translations:Adventist Youth Honors Answer Book/Nature/Birds - Advanced/22/en
From Pathfinder Wiki
(5) How fast do the wings and heart beat?
Hummingbirds are known for their ability to hover in mid-air by rapidly flapping their wings 15–80 times per second (depending on the species). Their heart rate can reach as high as 1,260 beats per minute, a rate once measured in a Blue-throated Hummingbird. However, they are capable of slowing down their metabolism at night, or any other time food is not readily available, entering a hibernation-like state known as torpor. During torpor, the heart rate and rate of breathing are both slowed dramatically (the heart rate to roughly 50–180 beats per minute), reducing their need for food.
(6) How is the tongue shaped?
Hummingbirds' tongues are bifurcated - a fancy way of saying that like a snake, the hummingbird has a forked tongue.
