interesting facts about backyard birds (2) Hummingbirds

来源: 2022-10-26 12:14:21 [博客] [旧帖] [给我悄悄话] 本文已被阅读:

1. Some Hummingbirds Weigh Less Than a Penny

Most people realize hummingbirds are pretty slight of stature: Their tiny bodies allow them to take flight quickly. While there are over 300 types of hummingbirds, the smallest species, the Bee hummingbird, weighs in at just 2 grams—.5 grams less than a U.S. penny.  

2. Hummingbirds Can’t Walk

There are some compromises that have to be made when you’re a bird that can fly backwards. To reduce drag, hummingbirds have very tiny and non-locomoting feet. Their legs allow them to perch and shuffle sideways a bit, but they’re not designed for long walks.

3. Hummingbirds are Always Starving

With fierce metabolisms brought on by constant movement, hummingbirds are always in search of nourishment—they require so much of it, in fact, that they’re perpetually a few hours away from starving to death. Ruby-throated hummingbirds will eat up to three times their body weight a day.