Flight muscle enzyme activity of carnitine palmitoyl transferase (CPT; A), 3-hydroxyacyl-CoA dehydrogenase (HOAD; B), citrate synthase (CS; C), and lactate dehydrogenase (LDH; D) of yellow-rumped warblers (Setophaga coronata) fed diets enriched in monounsaturated (MUFA; n = 20), n–3 polyunsaturated (n–3 PUFA; n = 16), or n–6 polyunsaturated (n–6 PUFA; n = 20) fatty acids. Values are means ± SE. Values that do not a share a letter differ (P < 0.05). *Significant difference between MUFA and the n–3 and n–6 PUFA diets combined.