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El Bolsero de Bullock (Oeste)
Especies Focales Principales
El Bolsero de Bullock es un ave a la que se le suele encuentrar en bosques del oeste de los Estados Unidos, especialmente en árboles altos a las orillas de ríos y riachuelos.
Distribución
Hábitat
Suelen residir en bosques abiertos y cercanos a las orillas de ríos y riachuelos, o en sitios donde se encuentran árboles altos tales como en parques. Durante el invierno, también viven en bosques ribereños, o a la orilla del bosque. Algunos Bolseros de Bullock pasan el invierno en boques de pinos, encinos, o abetos.
Alimentación
Los Bolseros se alimentan de frutas, néctar, insectos, tales como orugas, y de otros invertebrados tales como arañas.
Comportamiento
Al Bolsero de Bullock se le suele ver urgando y extrayendo insectos y néctar de árboles y flores. También frecuenta comederos para tomar agua azucarada.
Anidación
Los Bolseros de Bullock construyen un nido colgante. Ellos tejan el nido con pelo animal, especialmente con crin. También usan cordones, fibras, hierbas, y lana, para luego forrar el interior con semillas de álamo y sauce, lana, o plumas. Los nidos se encuentran en árboles aislados a la orilla de bosques, arroyos y ríos, y en parques urbanos, especialmente si están cerca del agua.
Apariencia
Sonidos Típicos
© Thomas G. Sander / Macaulay Library
Descripción del Adulto
Ave de tamaño mediano.
De cola larga.
De pico delgado, derecho y puntiagudo.
Una o dos bandas blancas que contrastan con lo oscuro de las alas.
De color naranja o amarillo anaranjado.
El macho es de color naranja brillante, con la espalda, la garganta, la nuca y la parte de arriba de la cabeza negra y una línea negra y delgada que atraviesa sobre sus ojos.
Descripción del macho
El macho tiene la corona, nuca y espalda negras; el resto de su cabeza y sus plumas anteriores son amarillas anaranjadas. Tiene una línea negra que delinea sus ojos y una barbilla y centro de la garganta negras. La rabadilla la tienen de color amarillo o amarillo anaranjado. La pluma del medio de la cola es negra y las demás son amarillas, con las puntas oscuras o negras. Las plumas de las alas son negras y de borde blanco. Tienen una banda blanca ancha en el ala.
Descripción de la hembra
Tiene el abdomen y pecho entre café grisáceo y amarillo claro, con líneas oscuras evidentes pero sin ser negras. El gris amarillento o verdoso opaco se vuelve más claro hacia el abdomen. Las alas las tienen de color café grisáceo, con una o dos bandas blancas.
Descripción de los jóvenes
Los machos jóvenes del Bolsero de Bullock se parecen a las hembras adultas pero con las plumas del abdomen y pecho de un amarillo más brillante; Además por lo general no tienen plumas negras. El macho joven también tiene una cara amarrilla anaranjada, la barbilla negra, y los ojos delineados por una banda negra y fina. La parte de arriba de la cabeza es oscura como también lo son su espalda y el cuello; en la espalda tiene rayas y la cola es naranja. Sus alas son oscuras con dos bandas blancas. La hembra joven se parece a la hembra adulta.
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Fotos de la Especie
Especies Parecidas
El Bolsero de Baltimore macho tiene la cabeza entera negra y dos bandas blancas notorias en las alas. La hembra adulta y los jóvenes del Bolsero de Baltimore son más pálidos y se parecen a las hembras de los Bolseros de Bullock. Sin embargo, tienen la espalda más café, tiene más tonos anaranjados que amarillos, y tienen los lados de la cara más cafés que amarillos. La hembra del Bolsero de Baltimore también tiene una banda blanca recta en la parte superior del ala, a diferencia de la barra del Bolsero de Bullock delos jóvenes y hembras que tienen una banda aserrada en el borde. Las cobertoras primarias de las alas tienen puntas blancas en vez de bordes blancos anchos.
El Bolsero Enmascarado tiene la corona y el cuello anaranjados; un babero, cara, ojos, y cola negra.
El Bolsero del Dorso Rayado tiene una corona amarilla, rayas negras en la espalda, cola negra, y es un poco más grande. Las hembras tienen manchas negras en la espalda.
¿Sabías que…?
- Los Bolseros de Bullock se alimentan usando un método en el cual clavan el pico cerrado en la fruta y lo abren a la fuerza contra la pulpa lo que crea un espacio que le da a la lengua acceso al jugo de la fruta.
- El Bolsero de Bullock, antes de comer una abeja, le arranca y deja caer el aguijón, y es entonces que se traga la abeja.
- -El macho y la hembra del Bolsero de Bullock cantan, pero sus cantos son diferentes. El canto de la hembra es muy parecido al del macho, pero termina en notas más destempladas. Al principio del período de anidación, antes y después de la construcción del nido; la hembra puede llegar a cantar más que el macho.
- -Los jóvenes se parecen a las hembras adultas pero suelen ser de un amarillo más fuerte en la parte de abajo y suelen carecer de plumas negras.