Ah. I wondered about that. Our cats bring in mice, shrews and voles, but never eat the shrews. I had come to the conclusion it was something to do with the taste. However, tasting nasty doesn't seem to have conveyed an advantage on the shrews, as the cats still kill them. The mice get et - as do the voles, though they quite often can't eat a whole one :-/ We occasionally get the green and purple wobblybits left on the mat - I had put this down to the different dining habits of the two cats, one of whom will neck a mouse whole in 15 seconds, while the other eats in a more finnicky manner, from the outside in. I had considered collecting the wobbly bits to use in vole-au-vents.
Regards Richard
I found a dead swift in the house last week. Although she looks innocent I am sure this toothless cat was the culprit.