Look what the cat brought in (TW, if you don't like slithery things, don't open)

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Poor little thing was dead. No idea what it is.

Looks like an adder!

It's a grass snake. Poor little thing used to hate it when mine brought in anything, I keep the current cat indoors as he's really not very clever at all and can't cope outside unsupervised. Even supervised he fell in the pond. I really don't miss this bit even if he is constantly under my feet!

https://www.heath-hands.org.uk/blog/grasssnakes

It's not an adder, it's a harmless grass snake; the yellow markings are a dead giveaway. It's beautiful!