When my first child was born, we only had one cat. He was very attentive during pregnancy then left a dead mouse as a gift right by the crib. He was a mouser when he was young, but hadn't hunted in a few years, so it was obvious that he understood there was a new "kitten" to take care of.

When he was gone and we had one of the cats we have now, I had my second child. Now this cat had never hunted so much ad a spider, but she caught her only prey to date, another mouse, and left it beside a gift bag of baby stuff I had from work.

I could have definitely done without dead mice, but I was pretty touched that they understood and wanted to do something "nice" for the babies.