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Heat-stroke in nesting least tern chicks from Gulfport, Mississippi, during June 1980.

In 1980, nearly all of several hundred chicks of the least tern (Sterna albifrons) within a narrow beach nesting area about 900 m long in eastern Gulfport, Mississippi, died, and most of these died from 25 June to 1 July. This report presents histological data suggesting that the birds, estimated to be 1 to 2 weeks old, died of hyperthermia. Of five chicks removed from their nests in eastern Gulfport on 27 June, all stumbled and exhibited torticollis. At that time, one of every four chicks observed along the beach had already died. Two of the five removed birds died before reaching the laboratory. As convulsions in all affected birds became more apparent, their legs extended upward (Fig. 1) and began to twitch. The three remaining chicks, all moribund, were decapitated and examined grossly. Tissues of two were fixed in 10% phosphatebuffered formalin for histological preparation. Routine paraffin sections were stained using Harris' hematoxylin and eosin, and additional selected sections were stained using Weigert's method for elastic fibers and Masson's trichrome (4). Gross examination of the three necropsied birds revealed intestinal contents consisting of a chalky-colored fluid, some of which had been voided before the chicks were killed. Each had an empty stomach coated with a dark greenish substance, presumably resulting from regurgitated bile. No sign existed of undigested food, hemorrhaging, or ascites. Histological sections of the brain showed signs of early ischemic focal necrosis randomly dispersed throughout the tissue, with at least two confirmed (Weigert's method for elastic fibers) fibrin microthrombi surrounded by degenerating tissue in the cerebral