Most birds, and by that we mean 97 percent of all species, don’t have external genitalia and instead have what’s known as a cloaca (as did dinosaurs ). Seen in birds, reptiles, amphibians, some fish, ...
While Earth's slowdown is not noticeable on human timescales, it's enough to work significant changes over eons. One of those changes is perhaps the most significant of all, at least to us: ...