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If you were to trace human evolution backward in time and space, you'd eventually end up in Africa. There, millions of years ago, animal species evolved to walk upright on two legs and spend more of their lives on the ground than in the trees.

TAXONOMY, NOMENCLATURE and PHYLOGENY (Emslie 1988)(Ericson et al 2006) (Geyer et al 1993)(Hackett et al 2008) (Houston, 1994) (Miller 1995) (Sibley & Ahlquist 1990) (Tree of Life Web Project 2009) Describer (Date): Shaw (1797) Vultur californianus in Shaw and Nodder's Naturalist's Miscellany, vol 9, pl. 301 and text. Amadon (1977) retained Gymnogyps.

This video talks about how red eyed frogs stand their grounds. How they shake their butts in order to scare off their opponents, It is a way that they communicate with one another. They tend to do it to show they are marking their spots