Editing Laterality (section)

====In marsupials====
[[Marsupials]] are fundamentally different from other mammals in that they lack a [[corpus callosum]].<ref name="Nowak1999">{{cite book |last=Nowak |first=Ronald M. |title=Walker's Mammals of the World |url=https://archive.org/details/walkersmammalsof0002nowa |url-access=registration |date=1999 |publisher=Johns Hopkins University Press |isbn=978-0-8018-5789-8}}</ref> However, wild [[kangaroo]]s and other [[Macropodidae|macropod]] [[marsupial]]s have a left-hand preference for everyday tasks. Left-handedness is particularly apparent in the [[red kangaroo]] (''Macropus rufus'') and the [[eastern gray kangaroo]] (''Macropus giganteus''). The [[red-necked wallaby]] (''Macropus rufogriseus'') preferentially uses the left hand for behaviours that involve fine manipulation, but the right for behaviours that require more physical strength. There is less evidence for handedness in [[arboreal]] species.<ref name="Sci-News">{{cite web |title=All kangaroos are lefties, scientists say |website=Sci-News.com |url=http://www.sci-news.com/biology/science-kangaroos-lefties-02929.html |date=June 18, 2015 |access-date=June 19, 2015}}</ref>