th A Siberian Husky used as a pack animalWolves, and their dog descendants, would have derived significant benefits from living in human campsmore safety, more reliable food, lesser caloric needs, and more chance to breed.[37] They would have benefited from humans' upright gait that gives them larger range over which to see potential predators and prey, as well as color vision that, at least by day, gives humans better visual discrimination.[37] Camp dogs would also have benefited from human tool use, as in bringing down larger prey and controlling fire for a range of purposes.[37]Humans would also have derived enormous benefit from the dogs associated with their camps.[38] For instance, dogs would have improved sanitation by cleaning up food scraps.[38] Dogs may have provided warmth, as referred to in the Australian Aboriginal expression "three dog night" (an exceptionally cold night), and they A German Shepherd with a footballDomestic dogs inherited complex behaviors, such as bite inhibition, from their wolf ancestors, which would have been pack hunters with complex body language. These sophisticated forms of social cognition and communication may account for their trainability, playfulness, and ability to fit into human households and social situations, and these attributes have given dogs a relationship with humans that has enabled them to become one of the most successful species on the planet today.[34]:pages95-136The dogs' value to early human hunter-gatherers led to them quickly becoming