Probably eggs; I did see some about the right size in the kitchens, though I doubt these will be producing any time soon. Likely meat as well.

[Hello, small peeping friends, please cluster slightly away from him so that he can sit on the floor in the least royal manner possible, thank you.]

Most pets with a long history of domestication had some other purpose originally, after all. Cats to protect grain stores from vermin and dogs to hunt with.