News – July 2010

July 5, 2010 cora.rimoldi Comments off

Black-necked Swan *Cygnus melancoryphus*To open a breeding season: a cygnet. © Roberto Ares	Scarlet-headed Blackbird *Amblyramphus holosericeus*Juvenile © Claudia Furman
Long-tailed Reed-Finch *Donacospiza albifrons*© Jorge García Vicente	Roadside Hawk *Buteo magnirostris*© Mirta Ragonesi
Rufous-bellied Thrush *Turdus rufiventris*Leucism on external rectrix. © Jorge García Vicente	Saffron Yellow-Finch *Sicalis flaveola*Male and Female © Mirta Ragonesi
Ultramarine Grosbeak *Cyanocompsa brisonii*© José Luis Merlo	Yellow-billed Cardinal *Paroaria capitata*© José Luis Merlo
Rufous Hornero *Furnarius rufus*Three stages in the construction of the oven with a week difference. The partition wall is still to be built. © Carlos Gonzalez Ledo	Rufous Hornero *Furnarius rufus*Note there is an incipient partition wall on the left. When they resumed work almost two weeks later, they changed its position to the right. Unlike the rest of the oven which is built from bottom to top, the partition wall is built in vertical strips. © Carlos Gonzalez Ledo
New species: Long-tailed Meadowlark *Sturnella loyca*
Though taken almost two years ago, it is a most valuable record to the site. © Germán Pugnali
Unicolored Blackbird *Agelasticus cyanopus*Composite: Male and Female © Jorge García Vicente
Green-winged Saltator *Saltator similis*© Claudia y Tito Di Mauro	Southern Screamer *Chauna torquata*© Claudia y Tito Di Mauro
Coscoroba Swan *Coscoroba coscoroba*The position of this bird in the phylogenetic tree is being questioned. Genetic studies suggest that it is basal (more primitive) to the swans, but that it is closely related to the Cape Barren Goose. This standing bird looks more like a goose than a swan. Its legs are longer and are placed more at the center of the body, which gives it a more straight posture. Other differences with swans are the bill and the lack of caruncle. © Carlos Gonzalez Ledo
Yellow-browed Tyrant *Satrapa icterophrys*© Jorge García Vicente	Yellow-chevroned Parakeet *Brotogeris versicolurus*© Jorge García Vicente
European Starling *Sturnus vulgaris*After the molt the new feathers of the starling have white tips, which gives it a mottled aspect. With time mottles disappear because the tips wear off. © Claudia y Tito Di Mauro
Guira Cuckoo *Guira guira*A typical scene in cold weather: Guira Cuckoos huddle up to keep warm. © Jorge García Vicente	Sulphur-bearded Spinetail *Cranioleuca sulphurifera*© Jorge García Vicente
Yellow-winged Blackbird *Agelasticus thilius*Male © Claudia Furman	Yellow-winged Blackbird *Agelasticus thilius*Female © Jorge García Vicente