Una Sola Golondrina Arbórea Se Posa En Una Rama Mirando El Mundo

tree swallow bird migratory tachycineta glossy wings tail white underparts bill brown eyes palebrown legs feet natural artificial cavities socially monogamous forest hirundo bicolor aerial insectivore branch tree no people eyecatching shimmering blue black pure narrow face forked wetlands forager social huge flocks wintering swallow trees feathers swift aerial acrobatics