Breeding of Red-billed Tropicbird (Phaethon aethereus) in Clarion Island, Mexico

Diego Adolfo González-Zamora, Luis Felipe Angulo-Castellanos, Salvador Hernández-Vázquez, Humberto Almanza-Rodríguez, Alberto Piña-Ortiz, José Alfredo Castillo-Guerrero

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Abstract
The Red-billed Tropicbird is listed as a threatened species in Mexico. There is a notable lack of basic information about this species in the world. Between January-May 2015 and 2016 we confirmed its nesting on Clarion Island (there were reports and counts of couples flying around the island, but no evidence of nests). We estimate approximately 48 nesting couples on the island. The breeding season occurs between the months of December and May. When comparing our data with a report of couples flying in 1990 it seems that the population has remained relatively stable for the last 25 years.

Keywords: Breeding season, Seabirds, Revillagigedo, Nesting.

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