How old is your cat?
The last few years of our family cats life was spent him bringing in all sorts! Every morning we were greeted with leaves, sticks, discarded fag packets, pieces of newspapers and when they started to build a new estate across the road he brought in cement bags with lumps of concrete attached!! We don't know how he managed to get them through the catflap but he must have tried for hours!
It made us giggle and we assumed he brought those things in because it was all he could manage to catch at this age lol
Bless him I do miss Soots and his funny antics.