I have been raising meat rabbits for about 8 months. I have two litters now still with their mothers (was about to wean them), each mother had 8 kits and their cages are next to each other. This morning one of the 7 week old babies died for no apparent reason. They haven't had ear mites, noses are clean, no diarrhea (in fact when I removed it from the cage a nicely formed poop pellet popped out), and no sign that any of them were sick. In the same cage is one other rabbit who seems lethargic maybe? His siblings are hopping around the cage, going after the food and water as normal and he just sits there. Haven't seen it drink or eat at all this morning. What is happening? Help!