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Why are some bird hybrids fertile?

Biology Asked by Rowan Blackwell-Cronie on March 23, 2021

So, we all know that hybrids are infertile, that’s the definition of a species, but how come some parrot species can interbreed and still be fertile. For instance a military macaw and a blue and gold macaw can have offspring that are fertile and can breed to make further hybrid macaws. These two species are definitely different species and not sub-species. How is this possible?

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