At the end of the Cretaceous, as Spec and Home-Earth began to diverge, birds had already been evolving for at least 80 million years and had diversified widely. In fact, diversity of bird types (though not actual species count) was far higher in the late Mesozoic than it is today in our timeline, and it has seemingly stayed so in Spec. In Spec, the so-called opposite-birds (Enantiornithes) make up the biggest part of bird diversity. However, Neornithes, the only bird group that has survived on Home-Earth, already existed in the Late Cretaceous, and has survived and diversified in Spec. Most waterbirds as well as most of the less conspicuous groups of landbirds are neorniths. Thus, in many respects, the bird fauna of Spec is very similar to that of Home-Earth. There are, however, a number o