So you have to be "loco" in order to be "sapiens"? Somehow, I always knew it. Gary is of course correct that the type lot must be restricted to humans in Linnaeus' ken as of 1758. So much for my warm feeling: killed by a cold fact. It's interesting that Linnaeus thought that the main difference between humans and chimpanzees was whether they were diurnal or nocturnal. And he didn't even get it right, since chimpanzees are primarily active during the day, and grad students (whom many consider to be human) are chiefly active at night. Gary, I'm curious. Did Linnaeus really think that chimps "know themselves" (i.e., are sentient)? Andrew K. Rindsberg Geological Survey of Alabama