Piacobra boreal

miniatura|Canción e chamada.
A especie **piacobra boreal** (***Geothlypis trichas***) é un paxaro da familia dos parúlidos. Reprodúcese abundantemente en América do Norte, desde o sur do Canadá ao centro de México. O nome do xénero *Geothlypis* procede do grego antigo *geo*, "chan", e *thlupis*, un pequeno paxaro non identificado; a terminación "*-thlypis*" foi moi usada nos nomes científicos de especies de parúlidos. O adxectivo específico *trichas* tamén vén do grego, de *trikhas*, un tipo de tordo, palabra que deriva de *trikhos*, 'pelo'.

## Descrición 
[miniatura|Piacobra boreal (co nome "Yellow-breasted Warbler") en *[The Birds of America* de J. J. Audubon]]

O piacobra boreal é un pequeno paxaro canoro de dorso, ás e cola de cor oliváceo, gorxa e peito amarelos e ventre branco. Os machos adultos teñen unha máscara negra na face que se estende desde ambos os lados do pescozo aos ollos e fronte, que ten un bordo por arriba de cor branca ou gris. As femias son de aparencia similar, pero con partes inferiores máis claras e carecen da máscara negra. Os inmaturos son similares ás femias adultas. Os machos dun ano teñen unha máscara negra esvaída, que se vai escurecendo ata ser negra intensa en primavera.

**Medidas**: Estas diferéncianse principalmente nos debuxos faciais dos machos e na brillantez das partes amarelas. A subespecie do suroeste é a máis brillante e a máis amarela pola parte inferior.
* *Geothlypis trichas trichas* (Linnaeus, 1766)
* *Geothlypis trichas typhicola* Burleigh 1934
* *Geothlypis trichas ignota* Chapman, 1890
* *Geothlypis trichas insperata* Van Tyne, 1933
* *Geothlypis trichas campicola* Behle & Aldrich, 1947
* *Geothlypis trichas arizela* Oberholser, 1899
* *Geothlypis trichas occidentalis* Brewster, 1883
* *Geothlypis trichas sinuosa* Grinnell, 1901
* *Geothlypis trichas scirpicola* Grinnell, 1901
* *Geothlypis trichas chryseola* Van Rossem, 1930
* *Geothlypis trichas melanops* S. F. Baird, 1865
* *Geothlypis trichas modesta* Nelson, 1900
* *Geothlypis trichas chapalensis* Nelson, 1903

## Comportamento 
Reprodúcense en marismas e outras áreas húmidas con vexetación densa baixa. Poden atoparse tamén noutras áreas con arbustos densos e é menos común atopalos en áreas secas. As femias parecen preferir machos con máscaras máis grandes. O piacobra boreal pon de 3 a 5 ovos nun niño cupuliforme. Ambos os pais alimentan as crías. que invernan na parte sur da área de reprodución, América Central e as Antillas Menores. As formas do sur son fundamentalmente residentes. Esta especie é un vagante moi raro no oeste de Europa.

Comen insectos, que collen normalmente en zonas de vexetación densa, pero que ás veces capturan no aire. esta especie é aínda moi común.

A migración destas aves na Florida foi tamén moi estudada. Alí poden encontrarse con máis frecuencia na rexión peninsular do sur en vez de na rexión da costa do Golfo do norte da Florida máis preto do resto dos Estados Unidos. O pico de migración nesta rexión é das últimas semanas de setembro ata a segunda semana de outubro. Non se sabe moito máis sobre a migración de primavera na Florida, mais os padróns parecen similares aos da migración de outono.

Cómpre facer máis estudos para comprendermos os padróns migratorios específicos do piacobra boreal noutras partes dos Estados Unidos.

## Ecoloxía 
Os niños do piacobra boreal están sometidos a parasitismo de posta polo *Molothrus ater*.

## Notas 
## Véxase tamén 
### Bibliografía 
;Teses

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### Ligazóns externas 
*Common Yellowthroat Species Account - Cornell Lab of Ornithology
*Piacobra boreal (*Common yellowthroat*) - *Geothlypis trichas*  - USGS Patuxent Bird Identification InfoCenter
*Piacobra boreal en *Animal Diversity Web*
* Sons do piacobra boreal no Museo de Historia Natural da Florida
* 
* 
* "Maryland Yellowthroat" . New International Encyclopedia. 1905.