Why do YOU think some birds can fly?
by
Earth Rangers
·
They're small enough.
%
(33 votes)
They're light enough.
%
(93 votes)
They have big wings.
%
(56 votes)
They have big feathers.
%
(34 votes)
They have hollow bones.
%
(133 votes)
They have a special muscle.
%
(117 votes)
(Other)
%
( votes)
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