Which is the fastest bird

Which is longer:
а rattlesnake
or
a anaconda?

Which is the smallest bird:
a eagle
a magpie
a hummingbird?

Which is taller:
a giraffe
or
a tiger?

Which is the most dangerous animal:
a hare
a squirrel
a wolf?

Which is bigger:
a blue whale
or
a elephant?

Which is the laziest animal:
a beaver
a squirrel
a sloth?