It takes a team of scientists to determine that one of the reasons we like cats is because we're suckers for cute features like large eyes, a snub face and a high, round forehead. The sight brings on an uncontrollable impulse to nurture. I said it before and I'll say it again, Nids Love Big Eyes.
Rudyard Kipling explains eloquently the bargain cats struck when they decided to stick around.
"He will kill mice and he will be kind to Babies when he is in the house, just as long as they do not pull his tail too hard. But when he has done that, and between times, and when the moon gets up and night comes, he is the Cat that walks by himself, and all places are alike to him. Then he goes out to the Wet Wild Woods or up the Wet Wild Trees or on the Wet Wild Roofs, waving his wild tail and walking by his wild lone".