Abstract
The diet of feral cats on Amsterdam Island was studied by examining 241 scats collected during one year. Introduced rodents, mice (Mus musculus) and Norway rats (Rattus norvegicus) formed the bulk of the diet. Mice were the most common prey ; they occured in 82 % of the scats and were the only cat preys during the Southern winter. Norway rats occured in 30 % of the scats ; young animals weighing less than 100 g were especially preyed. Birds remains were found in only 8 % of the scats. Cats also scavenged on dead fur seals and cows. Cats settled all over the island, yet they are most numerous in the periphery, under an altitude of 200 meters.
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