A vagrant black-browed albatross Thalassarche melanophris bred with a grey-headed albatross T. chrysostoma on Marion Island at least four times between 2000 and 2009 (and continued to return to the colony until at least 2019). The eggs failed to hatch in three breeding attempts, but the pair fledged a chick in the 2006/07 breeding season. Genetic sexing identified the black-browed albatross as female and she shared all eight sampled microsatellite alleles with the chick, whereas the grey-headed albatross social parent did not match the chick. The fledgling was banded and re-sighted in its natal breeding colony in 2016 and 2018, when it displayed an intermediate black-browed x grey-headed albatross phenotype, similar to a putative hybrid photographed at sea off Australia. These results suggest that the black-browed albatross cuckolded its social mate with another grey-headed albatross in 2006/07. The failures of the other three breeding attempts at the egg stage possibly indicate genetic incompatibility with the social partner.

中文翻译：

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黑眉和灰头信天翁之间的杂交和戴绿帽子

一只流浪的黑眉信天翁黑海藻与灰头信天翁一起饲养T. chrysostoma2000 年至 2009 年间在马里昂岛上至少四次（并继续返回殖民地至少到 2019 年）。这些卵在 3 次繁殖尝试中都未能孵化，但在 2006/07 繁殖季节，这对小鸡长成了一只小鸡。遗传性别鉴定将黑眉信天翁确定为雌性，她与小鸡共享所有八个采样的微卫星等位基因，而灰头信天翁的社会父母与小鸡不匹配。2016 年和 2018 年，这只初出茅庐的幼鸟在其出生的繁殖群中被带状并重新观察，当时它表现出中等的黑眉 x 灰头信天翁表型，类似于在澳大利亚附近海域拍摄的假定杂种。这些结果表明，黑眉信天翁在 2006/07 年将其社交伴侣与另一只灰头信天翁戴绿帽子。