Family Cracidae (chachalacas, guans and curassows).
Reintroduction of guans of the genus Penelope (Cracidae, Aves) in reforested areas in Brazil: assessment by DNA fingerprint.
The Speckled Chachalaca (Ortalis guttata) and Rusty-margined Guan (Penelope superciliaris) are regularly reported in the Atlantic Rainforest of northeastern Brazil (Schulz-Neto 1995, Silveira et al.
They reproduce at a slow rate, perhaps one young per year for a pair of guans, which makes them vulnerable to habitat destruction and hunting.
The reason this guan hatching is significant is that the research could help the reproduction of one of the most endangered and least studied families of birds in Neotropical America," says Michael Macek, curator of birds at the St.
The goal of the project was to develop a technique for freezing guan semen, which could potentially serve as a model for the entire Cracid family.
then of Chiclayo in northern Peru, in September 1977 with the two of us making the first sightings of the White-winged Guan (Penelope albipennis) in exactly 100 years.
The color plates have been grouped between the original book and the updated section, with four black-and white figures having been eliminated and the color plate of the White-winged Guan replaced by a new one that Al Gilbert asked me to paint for the new edition.
Some species, such as the White-winged Guan and the Horned Guan (Oreophasis derbianus) have gone from essentially unknown to very well known and from no birds in captivity to viable captive populations.
We used a Chi-square test to examine if guans were using different habitats according to their availability.
We followed guans continuously after finding them as long as individuals and topography allowed.
We categorized non-adult Sickle-winged Guans as: (1) fledglings--individuals that did not have a tail or had their body covered with down and one-third of adult size, (2) juveniles--individuals with body feathers and a tail, but wing leathers were not fully grown and measured two-thirds of adult size, and (3) sub-adults--with more adult-like plumage, but less colorful and somewhat smaller than adults.