>>53181419technically just about everything can, there are very few truly obligate herbivores. Koalas, Sloths, Pandas, basically all of them are ex-omnivores that got severely metabolically handicapped by overspecialization.
But buns certainly aren't designed to digest it. It's like a human eating grass. It's not toxic, and you technically will get SOME smidgen of vital nutrition out of it, but more than a little and you'll probably feel pretty sick, and you definitely can't live off it.
>>53181466not unless in very dire straits. needs to be either starving especially of vegetative protein (or calcium if we're talking bone gnawing) or else driven completely unhinged through environmental stress to the point it sees its own children as territorial threats, or probably a combination of both, because hunger is a great way to stress out a ruminant.
A rabbit eating its children was very much not a happy bun to start with. A human in the same condition might do the same.
