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White-crowned Sparrow

Posted by on Jan 17, 2018 in Blog | 0 comments

White-crowned Sparrow

New About Town This juvenile White-crowned Sparrow (Zonotrichia leucophrys) showed up mid November in the town of Rancho Quemado on the north end of the Osa Peninsula.  It was first observed by Yolanda Rodriguez Corrales who is a member of the Biological Monitoring group of the community.  This is the first time this species has come this far south in its winter range to our knowledge, and believe me, it is a topic of conversation and new visitors to the area. While morphological differences are very slight between the male and the female,...

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Migratory birds leave the Osa/La Ida de las Aves Migratorias

Posted by on Apr 18, 2014 in Media Bar | 0 comments

Migratory birds leave the Osa/La Ida de las Aves Migratorias

It is that time of year again and most of our overwintering migratory birds have left the Osa Peninsula. There are a few stragglers however and a common passage migrant, the Swainson’s Thrush, that is flocking up, practice singing, and bringing up the rear. Here are the latest reports of migratory bird observations on the Osa for this week Semana Santa 14 – 18 April, 2014! 14 April: Baltimore Oriole (Icterus galbula) all decked out in his breeding plumage feeding on Cecropia fruit. Road to La Balsa. Yellow-bellied Flycatcher (Empidonax...

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Festival News

Posted by on Mar 5, 2014 in Blog, Media Bar | 0 comments

Festival News

¡El 1er Festival Internacional de Aves Migratorias estuvo este Primero de Marzo y fue un evento más exitoso que pude haber jamás imaginado! Con la participación de mas de 200 invitados, caminatas de aves entretenidas, charlas educativas, baile típico, stands informativos, arte, fotografía, y muchas actividades para los niños, no pudimos pedir mas!  Con todo el esfuerzo de los organizadores del festival, las comunidades de la Osa y colaboradores internacional, realizamos nuestros objetivos de; * celebrar las aves migratorias; * educar las...

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Featured Bird: Mourning Dove

Posted by on Jan 14, 2014 in Blog, Media Bar | 0 comments

Featured Bird: Mourning Dove

La Paloma Huilota (Zenaida macroura) es un ave migratoria neotropical y residente común que se encuentra en Los Estados Unidos todo el año y se reproduce principalmente en el central norte de los Estados Unidos y Canadá.  El rango invernal se extiende desde México hasta Panamá central.  Observaciones oficiales han sido reportadas en el nordeste de Costa Rica hasta Quepos y también la especie ha sido reportada en Panamá por El Volcán Barú.  Los guías de aves de la Península de osa han observado la Zenaida en Puerto Jiménez en años anteriores,...

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Featured Bird: Chestnut-sided Warbler

Posted by on Dec 18, 2013 in Blog | 0 comments

Featured Bird: Chestnut-sided Warbler

Simplemente porque es de la famila Parulidae, la familia con más representantes de aves migratorias en la Península de Osa, les traigo la Reinita de costados castaños (Setophaga pensylvanica), la reinita y ave migratoria más común que se encuentra aquí.  De solo 10 cm de largo, esta pequeña es mas reconocida por la línea colorada (costados castaños) bien definida por los lados en el plumaje del macho. También se conoce por andar con la colita hacia arriba, de la manera muy parecida a los Polioptila (gnatcatchers). La Setophaga pensylvanica se...

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Featured Bird: Golden-winged Warbler

Posted by on Nov 12, 2013 in Blog, Media Bar | 0 comments

Featured Bird: Golden-winged Warbler

The Golden-winged Warbler (Vermivora chrysoptera) is a North American Neotropical migratory bird in the family Parulidae that breeds primarily in the United States and overwinters on the Osa Peninsula from approximately October through March.  It is the first in our series of migratory birds that we will be presenting in the weeks leading up to the first annual International Migratory Bird Day Festival being held in Puerto Jimenez on March 1, 2014.  It is the first in a series primarily because it is a species that has undergone one of the...

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Presenting Osa Birds!

Posted by on Oct 20, 2013 in Blog, Media Bar | 0 comments

Presenting Osa Birds!

PRESENTING OSA BIRDS! This is the official launch of the Osa Birds: Research and Conservation website!  We are a non-profit charitable organization dedicated to birds on the Osa and southern Pacific region.  Our presence here on the Osa Peninsula and surrounding areas is centered on the conservation of resident and neotropical migratory bird species. Our primary focus is to understand that factors that limit some bird populations and look for innovative ways in which to reduce the pressures placed on birds through science, strategic...

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Featured Bird: Black-cheeked Ant-Tanager

Posted by on Oct 20, 2013 in Media Bar | 0 comments

Featured Bird: Black-cheeked Ant-Tanager

This months highlighted bird is very special in two ways because not only is it the bird that launches Osa Birds organizational website, but because it is also the only bird species endemic to the Osa Peninsula.  No other bird carries with it this auspicious title.  Partly because of its highly restricted range and also due to the anthropogenic pressures to its habitat, it is considered to be an endangered species according to the International Union for the Conservation of Nature and BirdLife International.  This makes this bird a high...

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Taxonomic Changes

Posted by on Oct 20, 2013 in Blog, Media Bar | 0 comments

Taxonomic Changes

IT’S ALL IN THE NAME! Here is a list of some of the newest taxonomic name changes for birds. New common names [highlighted in Bold] for birds found either on the Osa or in the southern Pacific region are listed below.  For other taxonomic order changes or merges/splits, please refer to the American Ornithologists’ Union (AOU) checklist of North and Middle American birds currently in its 7th edition and its supplements (most recently published is the 54th supplement 2013).  Our checklist of birds reflects all AOU current changes....

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Welcome Neotrops

Posted by on Sep 26, 2013 in Media Bar | 0 comments

Welcome Neotrops

NEOTROPICAL MIGRANTS ARRIVE! The Costa Rican rainy season marks the time of year when a large majority of Neotropical migratory birds arrive to the Osa.  Some birds arrive as early as August such as the Yellow Warbler (Setophaga petechia), and the Black-and-white Warbler (Mniotilta varia) while others such as the Ovenbird (Seiurus aurocapilla) and the Summer Tanager (Piranga rubra) typically arrive a bit later from mid to late September. Other species simply pass through the Osa such as the Swainson’s Thrush (Catharus ustulatus), the...

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