Fig. 1. The proportion of total nitrogen voided as urate, urea and ammonia in excreted fluid samples from Palestine sunbirds. Birds were either uricotelic (when urate was the main waste product) or ammonotelic (when ammonia was the main waste product). In seven of 52 cases, birds were ammonotelic; in the remaining 45 cases, birds were uricotelic. Values are means + S.D.