So they're regular animals that have gone through different developmental processes that would end up building a body, that is not what you expect. What this researcher based in Madrid, Spain, actually loves, is the ugly amazing animals. After all, he studies two-headed worms. We have these worms that are usually regular worms like with one head and one tail, that's normal, but sometimes they may have two heads or two tails. And on the other side, there are worms, which have one head and many tails always. Officially, he looks at bifurcated annelids, meaning things like earthworms that have come out of their larval stage with two heads, or spontaneously sprouted two tails, or some other combination of mixed up appendages.