Sexton beetle.

I had to look this one up, not heard of it before and it made me think of a Stag Beetle at first. It seems they are attracted to carrion. Perhaps there is a deceased mouse around your garden?

Having read all about the creature since it appeared, it is a fascinating character. I have often wondered where all the dead birds, mice etc. go! They take them down to a depth of 60cm which is astonishing and prepare them to feed the young. Ghoulish but efficient!

Mother Nature has some weird and wonderful ways!

Amazing to see it Ange. I hadn't seen one before either. A cleaner of the garden and recycled too!

Yep, quite impressive, Janey!

Wow! That's really fascinating, Ange! Thank you for sharing with us. Never seen one until you posted. Definitely impressive as you say.

It was a bit of a surprise to find it on the sill, Kate. Hopefully it's going about its work now!