Body Weight and Aspects of Pairing Chronology of Green-Winged Teal and Northern Pintails Wintering on the Southern High Plains of Texas

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Abstract
Body weights of 4155 green-winged teal (Anas crecca) and 380 northern pintails (A. acuta) were measured on the Southern High Plains of Texas from October through March, 1980-81 and 1981-82. Body weights for both species usually were less than previously reported and weight cycles during winter were not synchronous between species. For teal, average weights of each sex and age class increased from October to December, decreased to lowest levels in February, and increased again in March. Weights of northern pintails were highest in October and declined thereafter. Possible relationships are discussed between fluctuations in winter body weights and pairing chronology of these and other Anatinae.

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