HumansWas it just luck that our species survived and the Denisovans didn't? For millennia, our species advanced in lockstep with the Denisovans and it is hard to work out from archaeological finds why they disappeared from the planet while we now dominate it Leader
LifeLizards that lost their legs re-evolved them as the climate got wetter The snake-like lizards of the Brachymeles genus began with four legs, lost them about 62 million years ago, and then 20 million years later regained them to deal with a wetter climate News