New York Natural Heritage Program
Caspian Tern
Hydroprogne caspia (Pallas, 1770)
Birds
Caspian Tern (Hydroprogne caspia) Larry Master
Family: Terns, Gulls and Relatives (Laridae)

State Protection: Protected Bird
Defined as a Protected Bird by New York State law. This species may not be hunted or taken at any time in New York.

Federal Protection: Migratory Bird Treaty Act
The Migratory Bird Treaty Act implements various treaties and conventions between the U. S. and Canada, Japan, Mexico and the former Soviet Union for the protection of migratory birds. Under this Act, taking, killing, or possessing migratory birds, including nests or eggs, is unlawful unless specifically permitted by other regulations.


State Rarity Rank: S1
A State Rarity Rank of S1 means: Typically 5 or fewer occurrences, very few remaining individuals, acres, or miles of stream, or some factor of its biology makes it especially vulnerable in New York State.

Global Rarity Rank: G5
A Global Rarity Rank of G5 means: Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.


Did you know?
Caspian Tern young may begin to vocalize while still in the egg. When an adult gives a Fish Call signaling their return to the nest with food, the soon to be chicks may respond with begging calls before they are even hatched.

State Ranking Justification [-]
The Caspian Tern occurs locally throught its range and has probably never been common or widespread during recorded history. The first known nesting of Caspian Terns in New York occurred in 1986 and the species is therefore recently new to the state. There are only two known colonies statewide. This species is highly susecptible to human disturbance of nesting areas. Although trends indicate that numbers have increased in both New York populations since they were established, scarcity of suitable nesting locations away from predation and human disturbance may be a limiting factor in the state.

Short-term Trends [-]

Long-term Trends [-]