At the same time, Penick had people rate what they thought the ant smelled like. Most people said blue cheese, but some thought it smelled like rotted coconut. So Penick rotted a coconut in his backyard and found a mold growing on it that, sure enough, is the same mold (Penicillium roqueforti) that's used to produce blue cheese. Another mystery, solved.

So American house ants, rotten coconuts and blue cheese all smell the same. Life is weird.