[nemo]

There's quite a few more birds than mammals, though mammals are not especially diverse, esp. with 60% of mammal diversity in bats and rodents. There's at least 50k identified mollusk species, 65k identified arachnids, and with insects things go nuts with ~900k. There's around 60k identified vertebrate species overall (fish, mammals, reptiles, birds, amphibians, etc), the invertebrates ~1.3 million.