ETA: I loose one perfectly good young rabbit about once a year. I just find them dead, or, like a couple months ago, find a stiff, mostly paralised but still living rabbit, that doesn't get better.

These guys are VERY well looked after, housed, watered and fed. I don't have predator problems. What I HAVE found is the occasional black widow and other unidentified spiders inside their wooden shelter boxes.

Don't know if spiders are the cause of not in my rabbits' deaths, just throwing it out there for you to consider.