Introduced species
Another threat to albatrosses is introduced species, such as rats or feral cats, which directly attack albatrosses or their chicks and eggs. Albatrosses have evolved to breed on islands where land mammals are absent and have not developed defences against them. Even species as small as mice can be detrimental; on Gough Island, the chicks of Tristan albatrosses are attacked and eaten alive by introduced house mice. Introduced species can have other indirect effects; cattle overgrazed essential cover on Amsterdam Island, threatening the Amsterdam albatross; on other islands, introduced plants reduce potential nesting habitat.