Cuculuscanorus, http://www.biologie.uni-hamburg.de/b-online/birds/2180_40.htm archive copy at the Wayback Machine https://creativecommons.org/publicdomain/mark/1
work of the following images: File:Flickr_-_Rainbirder_-_Cuckoo_(Cuculus_canorus).jpg licensed with Cc-by-sa-2.0 2010-09-12T17:01:49Z Dudubot 800x523 (90817
a derivative work of the following images: File:Cuculus_canorus_vogelartinfo_chris_romeiks_CHR0791.jpg licensed with GFDL-1.2 2011-02-24T13:12:47Z Vogelartinfo