Eisenmann's suggestion that nonbreeders are immature is probably valid, and it is supported by Pitelka's examination of dowitchers (1950:28, 51). [Please select]
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For gulls, which can be aged by characters of plumage, there is no question that most nonbreeders are immature. [Please select]
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We found evidence of breeding and also saw large flocks of birds that were either nonbreeders summering in the area or early, postbreeding migrants from more northerly places. [Please select]
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Loetscher (1955:26-27) does not report records for Veracruz in summer, but records of the species in Yucatán on May 31, 1952 (Paynter, 1955:101), and on June 16, 1900 (Mexican Check-list, 1950:79), probably represent summering nonbreeders. [Please select]
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