Breeding adult. Photo: Robert Cook/Audubon Photography Awards
Sterna hirundo
| Conservation status | Northeastern populations probably much lower than they were historically. Numbers reduced by plume hunters in late 1800s, increased again with protection early in 20th century, then declined again as populations of predatory large gulls increased in that area. Coastal Common Terns are more and more concentrated in a few well-protected colonies. Some inland populations are declining as well. |
|---|---|
| Family | Gulls and Terns |
| Habitat | Lakes, ocean, bays, beaches. Wide range of aquatic habitats in summer, both coastal and inland waters in low-lying, open country, where shallow waters for fishing are close to undisturbed flat islands or beaches for nesting. Winters mostly along coastlines in warm subtropical or tropical waters. |
Forages mostly by flying over water, hovering, and plunging to catch prey below surface. Sometimes dips down to take items from surface of water, or pursues flying insects in the air. Occasionally steals food from other terns.
1-3. Variable, buff to pale blue or olive, marked with brown and black. Incubation is by both parents (female may do more), 21-25 days. Young: Leave nest after a few days but remain nearby, are fed by both parents. Age at first flight about 22-28 days; may remain with parents another 2 months or more. One brood per year, rarely two.
Leave nest after a few days but remain nearby, are fed by both parents. Age at first flight about 22-28 days; may remain with parents another 2 months or more. One brood per year, rarely two.
Mostly fish. Feeds on a wide variety of small fish, focussing on whatever types most easily available, sometimes concentrating on shrimp instead. Also eats other crustaceans, insects, marine worms, small squid, leeches, marine worms.
Usually first breeds at age 3-4 years. Nests in colonies, sometimes in isolated pairs. In aerial courtship, groups and pairs perform high flights. Male may fly over colony carrying fish; female follows. On ground, pair postures, bows, struts in circles; male presents fish to female. Nest site is on bare ground or surrounded by low vegetation; sometimes on floating mat of dead vegetation. Nest (built by both sexes) is shallow scrape in soil, usually lined with bits of plant material and debris.
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