Introduction 200
Evidence of Play exists across the animal kingdom and indicates how old play is.
Animal play has been described as a phenomenon, and research into play extends to all mammals and can provide a valuable insight into evolution in different species. Features of play are recognised across a wide variety of species in both wild and domesticated animals . Young animals often play, but dogs are unusual in that they carry on into adulthood. Research has not found play to be easily defined and it does vary across species. Some Researchers have found adult play difficult to assess where it hasn’t fitted in with traditional ideas and Theories have differed on why play happens, and whether this stems from a single functional