Cats and Human Babies

I just discovered something. I was wondering why humans and other animals, especially mammals, breastfeed in exactly the same way, and why baby animals behave like human babies.

With cats in particular, I've come to the conclusion that, for most of their lives, they live like human babies because they don't have consciousness or develop in the same way. They do develop a little, though, and they complain.

Another thing I've noticed is that this cat doesn't have a mother, so she sucks on my fingers. When she plays, she moves her paws in the same way babies move their hands and feet while suckling on their mama's tits. I don't know how to explain it. When babies start suckling, they move their hands, pushing them against the person they're breastfeeding from. Cats do the same kind of thing.