Least Tern (Sternula antillarum) August 3, 2020 1500 × 1200 Least Tern (Sternula antillarum) Least Tern (Sternula antillarum) adult, May 2018, Napeague. Breeder. DECLINING. Late May, 2018. Napeague, Long Island. Shores. Breeder. DECLINING.