What does the author imply about the rate hummingbirds’ wings beat?
A.Although the bee hummingbird is the smallest, its wings don't beat the fastest.
B.The hummingbird's wings beat faster when it is sucking nectar than when it is just flying.
C.The rate is not much different than that of other birds of its size.
D.The speed at which a bee hummingbird’s wings beat is not actually known.