Data from: Chemical defence in avian brood parasites: production and function of repulsive secretions in common cuckoo chicks

Alfréd Trnka, Milica Požgayová, Petr Procházka, Miroslav Capek & Marcel Honza
The use of active chemical defence against predators is relatively rare in birds. Among others, it has been reported for some members of family Cuculidae whose chicks, when threatened, expel dark foul-smelling liquid from their cloaca. Apart from the brood parasitic great spotted cuckoo Clamator glandarius, however, this phenomenon has not yet been systematically studied in any other cuckoo species. Here we investigated the repellent behaviour in the evicting brood parasite, the common cuckoo Cuculus...
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