Sunil, with a PhD backing him up, I certainly wouldn't take issue with Dr. Willis. I suspect that the bullheads attempting to spawn in my trash cans were just a psychotic south LA knockoff of the genuine article and didn't know they weren't supposed to go into those cans. Typically, instead of doing the construction work, they decided to follow the path of least resistance. Should I ever discover another knockoff bullhead problem, I'll remove the masqueraders with trash cans and introduce a few with the proper pedigree, then I won't have to cope with such aberrant bullhead behavior.