3 ms·
I've always wondered how birds evolved to fly. It seems like wings are useless until they can fly.
by cellular 7y ago
I've always wondered how birds evolved to fly. It seems like wings are useless until they can fly.
- ken 7y agohttps://en.wikipedia.org/wiki/Origin_of_avian_flight https://en.wikipedia.org/wiki/Origin_of_avian_flight