Jessica and Calvin often have little tussles, with one mounting the other in a display of dominance. And, being bunnies, they also consume a fair amount of fur when they groom themselves.
Well this morning, Jess gets mad at Calvin for something and starts mounting his head. I was standing right there and, thinking that Calvin didn't do anything to deserve the treatment, I pull Jess off of him. I noticed that Jess had a hunk of Calvin's fur hanging from her mouth. I tried to blow it off of her (rabbits are very touchy about someone touching them on the chins, so I didn't feel like risking my fingers to pull it off by hand), but it didn't work. And then she starts eating the fur!
I've always kidded Calvin that he was Jess's chew toy. I didn't know that I was so accurate! :-)
PS Calvin was none the worse for the encounter. While I can see the spot where the fur came from, it's only because of the pattern in Calvin's coat - it's a darker spot because the dark undercoat is more visible. He takes chunks of fur out of Jessica, too, which leaves bare spots on her (usually on the back of her neck).