" For a land predator. Birds and fish, obviously, don't have arms!" Fish don't have legs, either. Or do they?.... There's a vast amount of scientific opinion that thinks that land animals evolved from aquatic ones. Look at lung fish. They managed to evolve their fins into limbs, so they could climb about as their habitat dried out. Many scientists think that that's how the 4-limbed species originated. And as for birds, yes they do have four limbs. Their arms evolved into wings. Some, (if not all) birds still have vestigal fingers in their wings, which helps them spread/close their feathers for different types of flight. And let's not forget the tail. Fishes had tails. On land these proved useful for most species, although the way they were used changed and so the shape changed. In Mankind (and chimpanzees), the tails weren't used much and diminished til they were virtually non-existant. But they're still there (as the coccyx - the bit of the end of the spine that doesn't actualy do much). Cheers, Diolma