cat has just brought in a weasel for the first time...
Once my deceased cat brought a live snake into the house. And also mice (dead). He also picked up moles, but never killed, but dragged them to the door, and then let it go. I was not very pleased with moles afterwards devastating my garden. Bad kitty.
When I was kid, I stayed the my grandmother house in the southern Moravian countryside. As a city boy, I never seen a snail, so I picked around the countryside a full box of them and brought them inside of her house. Worried that she would be too pleased with my life collection, I hid them in the water tank at her extensive orangery where she stored subtropical plants. The snails got out and went into feast. For year they drove her crazy, because they were everywhere, and they had to call exterminator. When i was older, i mentioned to my grandmother what I have done, and she laughed it of. She suspected her elderly neighbor was jealous and was throwing snails over the roof into her courtyard.