In January 1968, a captive of the northern race of the Collared Forest-Falcon ( Micrustur semitorquatus naso) in the National Zoological Park, Washington, D.C., a bird without a mate, laid two eggs on a crude assemblage of sticks and other nesting material in the temporary quarters in which it was housed for the winter season.One of the eggs was broken.
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Alexander Cruz (1974) studied this question.
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