Complex sentence: Nasal turbinates are absent or very small in some birds (such as ratites, Procellariiformes and Falconiformes) and some mammals (such as anteaters, bats, elephants, whales and most primates), although these animals are fully endothermic and in some cases very active.
Split into simpler sentences: Nasal turbinates are absent or very small in some birds, such as ratites, Procellariiformes and Falconiformes. They are also absent or very small in some mammals, such as anteaters, bats, elephants, whales and most primates, although these animals are fully endothermic and in some cases very active.