Nine species of birds are reported for the first time from Rio Magdalena: Procellaridae Puffinis lherminieri Lesson, P. griseus Gmelin), Phaethonidae (Phaethon lepturus Doudin), Ardeidae (Philerodias pileatus Boddaert), Tigrissoma fasciatum Such), Threskiornithidae (Mesembrinibis cayannensis Gmelin), Rallidae (Fulica americana Gmelin), Laridae (Sterna fuscata Linnaeus, S. superciliaris Vieillot). They were associated to the mangrove swamp areas (Avicennia germinans, Conocarpus erecta, Laguncularia racemosa, Rhizophora mangrove) in the External Delta of the Magdalena River (Department of Magdalena, Colombian Caribbean), characterized by a unique microclimate in Colombia.
