I have several cats that all became pregnant around the same time. Now that they are having the kittens they are sharing the same nest. Is this common for cats to share the same nest? Do I need to be concerned about this behavior?

I guess they feel safety in numbers and it probably relates back to feral cats which do the same thing in the wild. I wouldn't worry about it if they don't show aggression, which you probably would have mentioned had that already occurred. They know what they are doing, better then you do.

Now what will you do with all the kittens ? Have you heard of spaying ?

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