Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleComparison matters: Curiosity, bears, surplus energy, and why reptiles do not play.AuthorsBurghardt, Gordon M.PublicationBehavioral & Brain Sciences, 1982, Vol 5, Issue 1, p159ISSN0140-525XPublication typeArticleDOI10.1017/S0140525X00010979