tit-cuckoo feeding in nest box
Great Tit is feeding own (unsuccessfully) and Common Cuckoo nestling. This is accompanying video to publication: Grim T., Samaš P., Procházka P. & Rutila J. 2014: Are tits really unsuitable hosts for the common cuckoo? Ornis Fennica 91(3): 166–177.
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tit-cuckoo feeding in nest box
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