Saturday, May 28, 2016

Rose Breasted Grosbeak

Rose Breasted Grosbeak

Close-up of beautiful male Rose-Breasted Grosbeak stopping by in the Great Smoky Mountains of North Carolina. This is the extreme southern end of their breeding range.

The rose-breasted grosbeak's breeding habitat is open deciduous woods across most of Canada and the northeastern USA. In particular the northern birds migrate south through the United States east of the Rocky Mountains, to winter from central-southern Mexico through Central America and the Caribbean to Peru and Venezuela. The southern limit of its wintering range is not well known; it was for example only recorded in the SerranĂ­a de las Quinchas (Colombia) in the 1990s. In winter, they prefer more open woodland, or similar habitat with a loose growth of trees, such as forest edges, parks, gardens and plantations, ranging from sea level into the hills, e.g. up to 5,000 ft (1,500 m) ASL in Costa Rica.

The first birds leave the breeding grounds as early as August, while the last ones do not return until mid-late May. In general, however, they migrate south in late September or in October, and return in late April or early May. It appears as if they remain on their breeding grounds longer today than they did in the early 20th century, when migrants were more commonly seen in May and August than in April or September. The rose-breasted grosbeak occurs as a very rare vagrant in western Europe. [14] During breeding it is fairly territorial; in winter, it roams the lands in groups of about a handful of birds, and sometimes in larger flocks of a dozen or more.

The rose-breasted grosbeak forages in shrubs or trees for insects, seeds and berries, also catching insects in flight and occasionally eating nectar. It usually keeps to the treetops, and only rarely can be seen on the ground. In the winter quarters, they can be attracted into parks, gardens, and possibly even to bird feeders by fruit like Trophis racemosa. Other notable winter food includes Jacaranda seeds and the fruits of the introduced busy Lizzy (Impatiens walleriana).[15] In grosbeaks from the north-central United States and southern Canada, it was found 52% of the stomach contents were comprised by invertebrates, predominantly beetles; 19.3% was made up of wild fruits; 15.7% by weed seeds; 6.5% by cultivated fruits and plants, including peas, corn (Zea mays), oats (Avena sativa) and wheat (Triticum vulgare); and the remaining 6.5% by other plant material, including tree buds and flowers.[16]

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