When additional information is available on the Nests are situated on barren to sparsely vegetated places near water, normally on sandy or gravelly substrates. Premating displays are accompanied by the male tern posturing followed by the two terns circling each other. Courtship is an elaborate ritual that usually takes place near an exposed tidal flat or beach. As a result, a preponderance of nests is often initiated prior to the late spring rise and is lost to inundation. Often seen flying low over the water, with quick deep wingbeats and shrill cries. Least Tern rates a 14 out of 20 on the Continental Concern Score. The Least Tern is the smallest tern in North America and nests on sandy beaches along both coasts of the United States, and along major rivers in the interior of the continent. … The North American Waterbird Conservation Plan estimates a continental population of 60,000-100,000 breeding birds, and lists it as a Species of High Concern. Least terns breed and nest from mid-May to early August Our research focused on the potential for on‐channel reproductive success in the contemporary lower Platte River (LPR) and historical and contemporary central Platte River (CPR) finding that: (1) there is no evidence that interior least terns (Sternula antillarum athalassos; hereafter, least tern) and piping plovers (Charadrius melodus) are physiologically adapted to begin nesting concurrent with the recession of … Most begin arriving at their breeding sites in late April. While its breeding range is broad, and it is common in places, this species has faced many challenges.

Least Tern - Sternula antillarum adult breeding, Reproduction-nesting. management areas with a 3-year mean reproduction rate of 1.0, the California least tern may be considered for threatened status. Because of human interference and habitat loss, least terns are classified as threatened, endangered or of concern in most states. Only after courtship has confirmed mate selection does nesting begin by mid-May and is usually complete by mid-June. No one knows for sure where they overwinter.

Least terns can live 10 years or more. Reproduction. Least tern fledge ratios exceeding 2.0 fledglings/pair have not been observed on the Platte River even in the absence of flooding.

The California least tern arrives at its breeding grounds in late April.

Ref:flle266226 Reproduction: Least terns arrive in Connecticut in early May and quickly form pairs that last the whole season. This species arrives in late April to May. Within the contemporary AHR and LPR, piping plovers nest from late April to early August with the highest proportion of nests being initiated during May. Courtship typically takes place removed from the nesting colony site, usually on an exposed tidal flat or beach.

Usually hovers before plunging into water for tiny prey; does more hovering than most terns. Least terns breed and nest from mid‐May to early August with the highest nesting incidence occurring in early June.

Females lay 1–4 eggs in late May, and incubation lasts about 20–25 days.

California Least Terns start breeding when about three years old. picture by Florent Lecourtier. In the 1800s, ladies wore hats with bird feathers, and Least Tern wings were used as decorations. Courtship occurs at or near the nest site. Least Tern populations declined by about 88% between 1966 and 2015, according to the North American Breeding Bird Survey. Young reach fledgling stage in 3–4 weeks but remain with their parents until migration. Mercury, selenium, DDT derivatives, and PCBs have been found in Least Terns throughout their range at levels warranting concern, although reproductive difficulties have not been observed. Least terns’ nesting habitat often overlaps with human recreation and residential areas. Within the con-temporary AHR and LPR, however, piping plovers nest from late April to early August with the highest proportion of nests being initiated during May.


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