This Tiny Bird’s Heart Beats 1,200 Times a Minute — And It Can Fly Backward

Hummingbirds are fascinating little birds found all over the Americas. They are known for their beautiful colors, aerial ...
来自MSN

Why hummingbirds are the only birds that fly backwards; the science explained

Hummingbirds are unique among birds for numerous reasons, and that also includes their backward flying capability. Like almost every other bird species, they can do it all: hover, fly upside down and ...