This article describes the invasion of two species of vertebrate animals, Ring-necked pheasant Phasianus colchicus and wild boar Sus scrofa, to a small coastal island in Peter the Great Bay. Both species are common on the mainland (the shortest distance between the island and the mainland is 6 km). While prospects exist for creating a small population of pheasants on the island, the wild boar (1 individual) has no prospects and is a foreign and undesirable element there (causing significant damage to nesting colonial waterbirds and the island ecosystem as a whole). The possible reasons why these animals were prompted to leave the mainland in the first place are discussed.

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