The chief targets have included land and marine iguanas, tortoises, and colonially nesting marine birds. While other introduced mammals (chiefly feral cattle and pigs) have served as prey, in recent years severe depredations on the unique endemic Ga/apagan fauna have been caused by the dogs. Feral and pariah dogs are both scavengers and predators. Problems derived from their presence are most apparent on the islands of Santa Cruz and lsabela. For example, domestic dogs intentionally introduced now exist as three major types: domestic, free-ranging or pariah, and feral.
Several species of mammals introduced onto the Galapagos Islands illustrate this ecological axiom.
Organisms introduced onto insular ecosystems, after they have become established, frequently increase to destructive numbers.
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