I also catalogued many larger mammal analogues that had four limbs. They might be an evolutionary branch that had lost the third pair. And there were birds. Or, again, bird-analogues. The bird analogues had what looked very much like feathers. I found it fascinating that the bird things flew like birds, and the small furry things flew like bats. It seemed that aerodynamics had a lot to say about animal flight here just as on Earth.