The Wilson Bulletin, Vol. 79, No. 4 (Dec., 1967), pp. 432-440 (9 pages) A total of 1,605 nest record cards from New York and Massachusetts and the Maritime Provinces of Canada were examined for ...
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Identify Bird Eggs by Color and Size
Bird eggs range in colors and can be ornately maculated with spots, blotches and scrawls. They vary in shape and size, and they must be thick enough to withstand the weight of an incubating parent but ...
THE inquiry into clutch and brood-size in the robin (Erithacus rubecula), which was first reported by David Lack in 1946, has now been closed. Later observations show that the breeding season in ...
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