Question

What is the smallest bird in the world

Answer 1

Bee hummingbird -The smallest bird is the bee hummingbird  and the Isle of Youth. Males measure 57 mm (2.24 in) in total length, half of which is taken up by the bill and tail, and weigh 1.6 g (0.056 oz) Females are slightly larger.

This is believed to be the lowest weight limit for any warm blooded animal.

Answer 2

HUMMING BIRD 
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HUMMING BIRD is the smallest bird in the world