Using data on the extent of prebasic molt in known-aged adult and first-winter Western Bluebirds (Sialia mexicana), we assessed the accuracy of the molt limit as a tool for ageing birds. Sixty-nine known-aged birds were examined over the winter 2002–2003 in upper Carmel Valley, California. We also examined 29 breeding males in spring 2004 to assess the accuracy of this method for ageing birds during the breeding season. All birds were aged correctly using molt limit as the defining characteristic. We found that all first-winter birds had replaced 2–8 greater secondary coverts, while adults had replaced all wing coverts. We observed no significant sexual variation in the extent of first prebasic molt. These results indicate that the extent o...
Abstract Background Accurate nestling age is valuable for studies on nesting strategies, productivit...
External ageing of Common Snipe (Gallinago gallinago) still engenders considerable problems. To impr...
I examined 3442 specimens and measured the width of the premaxillary process at the gape (“gape widt...
Using data on the extent of prebasic molt in known-aged adult and first-winter Western Bluebirds (Si...
Abstract ∙ Knowledge of molt patterns and their resulting plumages is useful for aging and sexing bi...
A technique for distinguishing adult from yearling wild mallards (Anas platyrhynchos), from late win...
Molting is an important process of birds’ natural history and learning about molt and plumage allows...
Methods for quantifying molt in adult and juvenile Dark-eyed Juncos (Junco hyemalis) at Mountain Lak...
Little attention has been paid to molt and age criteria in hummingbirds despite the importance of mo...
Desde 1986 a 1989, 286 cotorras (Myuiopsitta monachus) de edad conocida fueron clasificadas como adu...
Author Institution: Department of Zoology, Ohio University, Athens, OhioBecause feather-replacement ...
Determining the age of birds is important to understand the demographic dynamic, since the effects o...
Various methods of determining age of passerine birds, using eye color, shape of flight feathers, pl...
Determination of a bird’s age or cohort is critical for studies on avian demography, occurrence patt...
Time constraints influence various ecological, life-history, and demographic properties of individua...
Abstract Background Accurate nestling age is valuable for studies on nesting strategies, productivit...
External ageing of Common Snipe (Gallinago gallinago) still engenders considerable problems. To impr...
I examined 3442 specimens and measured the width of the premaxillary process at the gape (“gape widt...
Using data on the extent of prebasic molt in known-aged adult and first-winter Western Bluebirds (Si...
Abstract ∙ Knowledge of molt patterns and their resulting plumages is useful for aging and sexing bi...
A technique for distinguishing adult from yearling wild mallards (Anas platyrhynchos), from late win...
Molting is an important process of birds’ natural history and learning about molt and plumage allows...
Methods for quantifying molt in adult and juvenile Dark-eyed Juncos (Junco hyemalis) at Mountain Lak...
Little attention has been paid to molt and age criteria in hummingbirds despite the importance of mo...
Desde 1986 a 1989, 286 cotorras (Myuiopsitta monachus) de edad conocida fueron clasificadas como adu...
Author Institution: Department of Zoology, Ohio University, Athens, OhioBecause feather-replacement ...
Determining the age of birds is important to understand the demographic dynamic, since the effects o...
Various methods of determining age of passerine birds, using eye color, shape of flight feathers, pl...
Determination of a bird’s age or cohort is critical for studies on avian demography, occurrence patt...
Time constraints influence various ecological, life-history, and demographic properties of individua...
Abstract Background Accurate nestling age is valuable for studies on nesting strategies, productivit...
External ageing of Common Snipe (Gallinago gallinago) still engenders considerable problems. To impr...
I examined 3442 specimens and measured the width of the premaxillary process at the gape (“gape widt...