Oriental Cuckoo Cuculus saturatus is notoriously difficult to distinguish from Cuckoo C. canorus in the field, other than by its diagnostic call, typically rendered 'oo-poo-poo-poo' and recalling a Hoopoe Upupa epops. Without direct comparison, many of the differences given in the literature are almost useless in the field. One reasonably helpful field feature is, however, clearly shown in these pho


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