why did some birds evolve verbal mimicry abilities? how does this help them survive?
or could it be a vestigial remnant of an even more fantastic verbal ability that an unknown common ancestor had?
https://www.youtube.com/watch?v=O7D-1RG-VRk
>>9116037
Bird calls mostly evolved for mating. Mimicry is either to impress mates, or to confuse competitors/predators. There was not some fantastical fallen bird civilization we've yet to uncover.
Yes, in fact Velociraptors had a very sophisticated language, as shown in the award-winning documentary Jurassic Park 3.