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activity adult males aggression agonistic Animal Play Australian magpie Behav Bekoff Biben biology birds brain Burghardt Byers canids captive Caro cats cognitive context display dominance relationships dopamine Eastern Grey Kangaroos ecology effects Ethology evolutionary example Fagen females form of play functions of play individual infant initiated intentional interactions involved juvenile rats Kaufmann 1974a locomotor play macropodoids Macropus robustus Macropus rufogriseus mammals Marc Bekoff motor patterns motor training nelsoni neural object play observed occur ontogeny Panksepp partner preferences Pellis & Pellis performed Pigface play behavior play bouts play fighting play partners play signals playful potoroids precocious courtship predation Press prey primates pronghorn ravens Red Kangaroos Red-necked Wallabies reptiles ritualised fights role reversal rough and tumble self-handicapping serious fighting sexual Siviy social play sparring matches species squirrel monkeys subordinate tactics threat signals turtles types of play Watson & Croft wrestling yearlings young
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Joanna Joy Bryson - 2001
Marek Spinka, Ruth C Newberry, Marc Bekoff - 2001 - Quarterly Review of Biology
Stuart G Shanker, Barbara J King - 2003 - Behavioral and Brain Sciences
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Victor Nell - 2006 - Behavioral and Brain Sciences
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