Tristan da Cunha is a 96 km² volcanic island in the South Atlantic Ocean. Black Rats Rattus rattus reached the island from a shipwreck in 1882 and their depredation of seabirds’ eggs and chicks are likely partly responsible for the much lower densities of burrow-nesting petrels, compared with adjacent rodent-free islands in the archipelago. We monitored a colony of Broad-billed Prions Pachyptila vittata breeding in a coastal cliff cave in 2015/2016, where a maximum of 6% of chicks survived from 310 nests. We suspect rats frequently depredated eggs (36% of eggs were found broken with rat bite marks) and infrared trail cameras recorded how rats repeatedly hassled chicks, although no direct chick depredations were recorded.

特里斯坦达库尼亚（Tristan da Cunha）是位于南大西洋的96公里^2的火山岛。黑鼠鼠（Rattus rattus）于1882年从海难到达该岛，与群岛中相邻的无鼠岛相比，它们对海鸟卵和小鸡的掠夺可能是造成巢穴海燕密度低得多的部分原因。我们在2015/2016年在沿海悬崖洞穴中监测了宽嘴Pr病毒Pachyptila vittata繁殖的殖民地，其中最多6％的小鸡从310个巢穴中幸存。我们怀疑老鼠经常弃用鸡蛋（发现有36％的鸡蛋被老鼠咬伤折断了），尽管没有记录到直接的雏鸡死亡，但红外跟踪相机记录了老鼠如何反复对小鸡进行折腾。