 Predators on the breeding grounds include feral and domestic cats , introduced American mink , feral ferrets , otters and red foxes , and birds including the common <unk> and hooded <unk> . In Lithuania , the introduced <unk> dog has also been recorded as taking corn crakes . When chicks are exposed by rapid mowing , they may be taken by large birds including the white stork , <unk> and other birds of prey , <unk> and <unk> . At undisturbed sites nests and broods are rarely attacked , as reflected in a high breeding success . There is a record of a corn crake on migration through Gabon being killed by a black <unk> . 
