ABSTRACT

In the breeding season of 2018, we found a much larger egg in one nest of Cinereous Tit (Parus cinereus) in Zuojia Nature Reserve, Jilin Province, China. The tit pair abandoned their nest soon after the alien egg hatched, which resulted in the death of the foreign chick. Based on DNA identification, this foreign chick was confirmed as a Great Spotted Woodpecker (Dendrocopos major), suggesting that the woodpecker laid or carried one of her own eggs into the tit nest. Limited cavity availability as the woodpecker lost its own nest might have contributed to this occurrence.

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