Blue-black Grassquits are sexually dimorphic and dichromatic, and males exhibit an iridescent blue-black nuptial plumage during the breeding season (Maia et al.
We captured male Blue-black Grassquits with mist nets from December 2012 to March 2013, in Fazenda Agua Limpa (15[degrees]56'S, 47[degrees]56'W), a farm property of the University of Brasilia, Brazil, in an area of disturbed native savanna (2.
Moreover, the mass/tarsus ratio successfully reflects intestinal parasite load and social dominance in male Blue-black Grassquits (Costa and Macedo 2005, Aguilar et al.
Differences in genetic data between grassquits
and the various species of Darwin's finches, which were found to have similar DNA despite variations in beak size and shape, led to the conclusion that the grassquits
found their way to the Galapagos some 2 million years ago.
Nest-site selection by Blue-black Grassquits
in a neotropical savanna: do choices influence nest success?
are sexually dimorphic granivores that have high breeding synchrony due to rapid and synchronous maturation of grass seed crops in the rainy season.
The oldest bird recaptured was a [greater than or equal to] 9-year-old female Black-faced Grassquit; we also recaptured one 6-year-old and three 5-year-old grassquits.
Other frequently captured resident species were Black-faced Grassquit (Tiaris bicolor; 148 captures) and Pearly-eyed Thrasher (Margarops fuscatus; 93 captures).
Examples of avian species that were observed within anthropogenic habitats and either fed, roosted, or both within villages and farms include the smooth-billed ani (Crotophaga ani), common nighthawk (Chordeiles minor), white-collared swift (Streptoprocne zonaris), Pacific hornero (Furnarius cinnamomeus), lemon-rumped tanager (Ramphocelus icteronotus), swallow tanager (Tersina viridis), blue and white swallow (Notiochelidon cyanoleuca cyanoleuca), blue-black grassquit
(Volatinia jacarina), shiny cowbird (Molothrus bonariensis aequatorialis), turkey vulture (Cathartes aura), black vulture (Coragyps atratus), cattle egret (Bubulcus ibis), and a variety of members of the Tyrannidae family (flycatchers) and Troglodytidae (wrens).
15; Francisco 2006) and the Blue-black Grassquit (Volatinia jacarina) (0.
For example, bimodal breeding for the omnivorous Yellow-faced Grassquit (Tiaris olivaceus) can be synchronized with two peaks of availability of different resource types (grass seeds and fleshy fruits; Skutch 1950).
Nestlings of the closely related Blue-black Grassquit
(Volatinia jacarina), remained in the nest for 10 days (Carvalho et al.