A friend feeds his cat Fancy Feast, in spite of negative information I've shared with him about this brand. He gave me this recently opened can, and asked what I thought was growing out of it. Besides looking something like a toupe, I can only guess that it's a fungi of some kind.
It's been growing rapidly, and I'd love to do a time lapse video, over a 24 hr. period, but I don't have a video camera.
Has anyone ever seen this kind of thing before, or know what could have caused it?