'These birds, which usually feed while hovering, flap their wings at a rate of 60-75 times a second'
hummingbirds
NATURE: These birds, which usually feed while hovering, flap their wings at a rate of 60-75 times a second
These birds, which usually feed while hovering, flap their wings at a rate of 60-75 times a second
These birds, which usually feed while hovering, flap their wings at a rate of 60-75 times a second
NATURE
hummingbirds
NATURE