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Cross‐plot for the δ15N values of trophic and source AAs, Glx and Phe, respectively, from kea feathers. Brown depicts ‘ancient’ kea (1887–1950) and yellow depicts ‘modern’ kea (1950–2007). Trophic isoclines with a slope of 1.0 and y‐intercept intervals of 7.6‰ represent different trophic positions (TPGlx‐Phe = 1, 2 and 3) according to equation 1 from Chikaraishi et al. (2010)
