Why do YOU think some birds can fly?

They're small enough.
% (38 votes)
They're light enough.
% (116 votes)
They have big wings.
% (73 votes)
They have big feathers.
% (44 votes)
They have hollow bones.
% (162 votes)
They have a special muscle.
% (142 votes)
They have hollow bones.
28.17% (162 votes)
They have a special muscle.
24.7% (142 votes)
They're light enough.
20.17% (116 votes)
They have big wings.
12.7% (73 votes)
They have big feathers.
7.65% (44 votes)
They're small enough.
6.61% (38 votes)
Back to poll
575 votes
Powered by StrawPoll