Brood Parasitism
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<speciesfyi-glossary slug="brood-parasitism"></speciesfyi-glossary>Definition
A reproductive strategy in which a bird lays its eggs in the nest of another species, which raises the young.
Detailed Explanation
The common cuckoo is the classic example: it lays eggs mimicking those of its host species (reed warblers, meadow pipits), and the cuckoo chick ejects all host eggs upon hatching. Host species evolve egg-rejection behaviors; cuckoos counter-evolve more precise mimicry — a coevolutionary arms race. Brood parasitism imposes enormous fitness costs on hosts, yet the behavior persists where parasite populations are high and host recognition is imperfect.