World Bird List

Species factsheet
Least Tern (Sternula antillarum)

Order: Sternula antillarum
Family: Gulls, Terns, Skimmers (Laridae)

Danske navn: Amerikansk Dværgterne

Voices can be found here (external link)
Subspecies and Distribution
Subspecie Distribution
athalassos c and sc North America
antillarum e and s USA to Honduras, Caribbean, n South America
browni c California (USA) to w Mexico