In terms of number of species,the most successful terrestrial vertebrates that invaded the air are

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While insects outnumber all other animal groups, birds have successfully diversified into thousands of species, each adapted to unique ecological niches. Pterosaurs are extinct, and while bats are extremely successful and diverse, their number of species is significantly less than that of birds. Flying monkeys are a fictional animal and do not exist in reality.

In Terms of Number of Species,the Most Successful Terrestrial Vertebrates