About five years ago I got given two bunnies a black and a white one who were brothers. They lived outside in a covered hutch with outside space. Over Christmas we went away for the night before we left I checked and fed the bunnies both were acting normal and eating fine. However when we returned the next day the black one was laying on its side and had died. This was upsetting and I felt bad for the white bunny so we bought a female bunny to keep him company and they seemed to get along well, she was around two years old. We’ve had her for around five months. Yesterday I noticed she was acting a bit slow but she was still eating and going to the toilet so I didn’t worry to much. This morning I checked on her and she was laying on her side and had passed. Once again the white bunny is complete fine. This is really upsetting and I feel bad for my white bunny cause he enjoys other rabbits company, I’m just wondering what could be the cause of these two deaths and if I could have avoided it.