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I feel like it would be a major improvement to the world if instead of having wings, birds had arms, but they could still fly. Like this:
So the smaller birds would have arms the size of the body length, but birds like hawks would only have tiny buff ones. The catch is, the arms don’t work whatsoever, and the birds have no feeling in them, so they just drag along. But birds like penguins who can’t fly get to use their arms, and they eventually grow human legs, so they swim to the Americas and Africa and go around winning UFC matches.