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Rabbits make two different kinds of droppings: feces, and cecotropes. Feces are the normal small hard balls left behind by rabbits in their litter boxes and around their habitat. Cecotropes are not often seen, because they are eaten by the rabbit from the anus, in a form of reingestion called "cecotrophy."
A rabbit that is seen to chew and spit out his or her feces may have accidentally taken the feces in his mouth while ingesting cecotropes, or he may have found the feces in his territory and given it a little nibble to determine who put it there. These behaviours are unusual but not necessarily anything to worry about; however, as always when you notice your rabbit performing a new or odd behaviour, keep close eye on him and bring him to the vet's at first sign of illness. If your rabbit is healthy and normal in all other ways, just make a note of the odd event and bring it up at your next regular vet appointment.
See the related questions below for more details.
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Rabbits chatter or grind their teeth for two different reasons. The two different sorts of tooth grinding look and sound very different from each other, although it might take some experience to recognize the differences.
One Reason: Rabbits grind their teeth because they like what you are doing, and they are very comfortable and pleased e.g. when you're stroking it, giving it a head massage etc. This sort of grinding sounds like a purr - the teeth are lightly and quickly chattering in a rhythmic fashion.
Another Reason: Rabbits also grind their teeth because they're in pain or extremely uncomfortable. This sort of chattering is more like a crunching or grinding than chattering; it's louder than the purring sound, and it's not rhythmic. If your rabbit's in this much pain, something is seriously wrong and it needs help from the vet immediately.
If you're not sure which sort of tooth grinding your rabbit is doing, look at other body language:
A rabbit in pain has, for example, glassy eyes, a hunched or unusual posture, depression (hiding, not moving or else greatly reduced activity levels, not responding to a chipper "hello" or a favourite treat), and/or GI stasis (no pooping or eating) and dehydration.
A happy rabbit recently was, and is soon again, hopping around, munching hay, using the litter box, interacting with its environment (playing, exploring, smelling, scratching), and interacting with you (responding to your voice, making eye contact, moving its ears around) -- unless, of course, it's the rabbit's bedtime (usually middle of day, and on and off overnight), in which case the rabbit looks comfortable.
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