Thread: What killed the Rat??

I've been seeing a few field mice now the maize has been cut, so set up a couple of rat/mouse live cage traps yesterday at 1pm.
I forgot about checking them before I went to bed, so took a look at 7am this morning.

Wow....longest and most obese bloody rat I've ever seen.

Its body was crammed into the full length of the cage trap of 250mm, with its bloody big long tail folded back against its body (did you know that it's an extension of its vertebral column?).
The food hook (that also operates as a trigger for the door to shut), was ripped out and the left side of the cage was slightly warped/bent.

But here's the thing.....it was dead.

It wasn't cold last night here...about 7 degrees.
It didn't get hung up/strangled in the spring that closes the door.
Checked its body for cuts/wounds...nothing.
So does anyone have a guess on what killed the rat? (they are usually tough little bastards).