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Buteogallus anthracinus is a tipically resident specie that create its nesting at the mangrove forest of Sontecomapan. This paper describes the nesting of B. anthracinus, evaluating size, composition vegetal of the nests and the specie host tree. In 2002 and 2003 by means of routes in boat and with special emphasis to sound emmission to six nests were located on mature trees were. It was found thah Rhizophora mangle, Laguncularia racemosa and Aviccenia germinans are used by B. anthracinus as host trees. The nests are oval in shape with an average 38,5 cm of in diameter, 69,83 cm of external diameter and 52,5 cm in height. The center of the nest is constructed mainly with-leaves of Avicennia germinans and the rest of Rhizophora mangle. It is discusses that the population of B. anthracinus can be dependent on the nest sites in this mangrove. [ABSTRACT FROM AUTHOR]