Red-eyed Vireo - 自然英语

Thisrollicking song belongs to a Black-headed Grosbeak. Like most birds, the malegrosbeak begins singing in earnest a few days after reaching his traditionalnesting grounds in spring.And,like most birds, he sings frequently when trying to attract a mate. He’ll singa bit less while he and his mate incubate eggs, but pick up the pace againafter the young hatch. By late summer, his singing will cease.Everwonder how much a bird sings in one day? Some patient observers have shown thata typic...