I am wondering if maybe this kind of behavior might be more common in outdoor cats than indoor cats, because none of the indoor cats I've ever had (and my mother raised Siamese cats when I was growing up) would consider such a thing. They would get really twitchy if any other cats came near their babies, male or female. There is one adult female outside though ("Gray Mama") who actually chases all other adult cats out of the building when she has kittens.This is a problem right now, as cold weather is closing in, and she still has one kitten out there that we haven't managed to catch yet (he's a wily little guy! I'm trying some of the tips I saw in the feral cats forum tomorrow
); she keeps chasing all the other stray kitties out of the building, and last night in the pouring cold rain
. All the other adult females out there are much more casual and relaxed about the other cats, probably because none of the males ever seem interested in messing the with the kittens at all. I dunno, I just thought it was an odd/neat situation with them swapping babies, kind of like a living example of "it takes a village to raise a child."