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Hydroprogne
genus of Sternidae within Charadriiformes

trivial name latin name name specimens
Caspian Tern
Hydroprogne caspia 		Hydroprogne caspia 001 001

species comparison1)

Genus Hydroprogne: maximal number primaries: 10, maximal number secondaries: 0, maximal number retrices: 12
1) According to Hartmann (2000a, 2000b and 2016)

Random specimens

Caspian Tern
Hydroprogne caspia