Some snakes show signs of self-recognition in olfactory tests

A trio of psychologists at Wilfrid Laurier University, in Canada, has found evidence that at least one type of snake may have self-recognition. In their study, published in Proceedings of the Royal Society B: Biological Sciences, Troy Freiburger, Noam Miller and Morgan Skinner used the olfactory sense rather than vision to test for self-recognition in two kinds of snakes.