I've just come home to see our 2 gerbils covered in blood and at opposite ends of their cage.
I have immediately separated them and phoned the vet for an appointment as soon as possible.
The only thing which could have happened is that they've fought each other...after 3 years together living happily. They are both male and we bought them together. Can this happen? Is anything likely to have set it off? Nothing has changed in their environment, though obviously for gerbils, I suppose they are both now quite old. I think one of them is quite poorly. 