RAT

The remains of a Brown Rat (Rattus norvegicus) 

Although I worry that Polo, our cat, might be catching birds, she does seem to concentrate on bank voles, woodmice and the occasional rat.

The long scaly tail is the best clue to the identity of this rodent.

Not much else to go on.  Although they are part of the native wildlife scene, brown rats are not desirable in the home or garden.

Brown rats can produce up to 5 litters of 12 young in a year.

So Go Polo Go.