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Klaas's Cuckoo is 16–18 cm in length. The ...
Det.: Klaas Reißmann und Dr. rer. nat. ...
Det.: Klaas Reißmann und Thomas F. ...
Det.: Christoph Benisch und Klaas Reißmann ...
Det.: Christoph Benisch und Klaas Reißmann ...
Rufous and green barred young cuckoo with a distinctive red bill
juvenile Diderick cuckoo, rufous and green with a diagnostic red bill. Much ...