When I was cleaning out our chinchillas' cage, I found what looks like blood stained on a small part of their bedding. I was concerned, so I checked around the cage and saw what looks like a smear of blood on one of the ledges.
It's worth noting that both chins seem to be eating/chewing normally and interacting normally (their usual behavior), and there are no signs whatsoever of a fight. One of them has a history of dry foot pads, so we checked that and his feet don't seem to be bleeding. There are no bloody paw prints anywhere on the wooden ledges. The bedding in their usual pee spot in the corner of the bottom pan was darkened normally, with no hint of any red coloration. As you can see in the pic, the bloody spot is not surrounded by any other moistened bedding, so I do not believe either chin is passing blood through urination. Their poop is normal as well.
They're playing now and their behavior is normal. There is no sign of blood on either of them. Anybody have any idea what this could mean, or where this blood may have come from?
The blood (if it's that -- it looks kind of orange) on the ledge is totally dry, and the bloody bedding didn't seem freshly stained either. The bloody mark on the ledge is roughly above the spot that I discovered on the bedding. Any ideas on what this might be from, or how to check for injuries we might have missed, would be greatly appreciated.