+Gavia stellata+ (Pontoppidan): Red-throated loon.--Specimens, 4: NE Teshekpuk Lake, 153 deg.05'40", 70 deg.39'40", 8 ft., No. 30576, ad. male and No. 30577, ad. female, July 29, 1951; Kaolak River, 159 deg.47'40", 70 deg.11'15", 30 ft., No. 30574, ad. male, July 18, 1951 and No. 30575, ad. female, July 14, 1951. At the west side of Salt Water Lagoon (June 17,1952) we observed a single red-throated loon feeding in the lake. At Point Barrow (June 21, 1952) 15 birds in one loose flock flew east along the shore of the Arctic Ocean. At Kaolak River (July 13, 1951) three pairs of red-throated loons nested among high sedges along the edges of small lakes (some as small as 100 x 40 feet). Of the three species of loons on the Arctic Slope, this one chooses the smallest bodies of water for nesting. Each of two nests held two eggs approximately 1/2 incubated. One nest and that of an Arctic tern were approximately 30 feet apart on an island in the center of the lake. The loons arrived and departed from the lake without molestation by the terns, but whenever we approached the lake a tern would fly 300 feet out on the lake to meet us. On July 14, the female loon was shot. The largest ovum was 8 mm in diameter. On July 16, we again visited the above mentioned nest. The male was incubating and left unnoticed. While we were inspecting the nest the loon reappeared only six feet away and uttered one guttural note seemingly of surprise. The loon hurriedly swam away keeping its head turned toward us and when at a distance of 25 feet, dove again. Fifteen minutes after we left the nest the bird could still be seen swimming about in the lake. On July 18 the male was shot. It weighed 2268 grams and its testes were 10 mm long. The eggs, measuring 73 x 42 and 69 x 43 mm, of this pair of loons held embryos having natal down. Although the loon usually approached the nest from the direction of open water, several trails led to the nest among sedges. One call by these birds resembled that of a wolf and was generally given between 11:00 P.M. and 2:00 A.M. Other calls were froglike, humanlike and birdlike in quality.