“…5), notably trigger fish (Soule, 1969), extinct mosasauroid lizards (Caldwell, 2007;Luan et al, 2009), at least one fossil snake (Budney et al, 2006), crocodiles (e.g., Tadokoro et al, 1998;McIntosh et al, 2002), and many extinct archosaurs including some dinosaurs and early birds (e.g, Edmund, 1960), argues for its general utility in the coordination of feeding activity. It is even found in modern birds that have been manipulated to redevelop teeth (Cai et al, 2009). However, investigations on mammals (particularly primates) have theorised that balancing side muscle activity must decrease to avoid disarticulation of the working side joint (Spencer, 1998;Greaves, 1982;Throckmorton et al, 1990;Koolstra and van Eijden, 1995).…”