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Some of these waterfowl hit remarkable sizes: The Pleistocene giant swan of Malta, which some researchers have suggested was land-bound, was 30 percent larger than a living mute swan.

“The New Jersey Division of Fish and Wildlife does not authorize relocation for mute swan since they are an exotic species,” Ms. Espinosa said.

As an invasive species, the mute swan has stirred debate in New York.

The mute swan, which has an orange bill and holds its neck in a graceful S-curve, isn’t native to North America.

The female mute swan, who lives at London's Highgate ponds, rejected all potential mates when her first love died after flying into a building.