CUCKOO parasite (Cuculus canorus) producing a fecal sac, UK.

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Cuckoo is 16 days old. Its foster parents are reed warblers (Acrocephalus scirpaceus).

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Size: 4896px × 3264px
Location: Lincolnshire, England, UK.
Photo credit: © Roy Waller / Alamy / Afripics
License: Licensed
Model Released: No

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