An article published in the journal “Proceedings of the Royal Society B” describes a search that turns upside down the cliché about wolves (photo ©Katerina Hlavata) are aggressive while dogs are tolerant. Friederike Range, Caroline Ritter and Zsófia Virányi of the Messerli Research Institute of the University in Vienna, Austria, conducted tests on mongrel dogs and wolves raising them in the same conditions. The conclusion is that dogs have a steeper hierarchy and are less tolerant than wolves to their conspecifics.