Hydroelectric dams represent an important threat to seasonally flooded environments in the
Amazon basin. We aimed to evaluate how a dam in the Madeira River, one of the largest …

ABSTRACT I examined images of over 6,300 individual hummingbirds from the Cornell Lab
of Ornithology's Macaulay Library to clarify conflicting reports on molt and plumage …

Corticosterone, the main glucocorticoid in birds, is a major mediator of the incredible
physiological feat of migration. Corticosterone plays important roles in migration, from …

Migratory landbirds are in decline across North America as factors like habitat loss and
climate change pose significant challenges across the annual cycle. Migration is a period of …

In the Amazon basin, several species are restricted to or occur primarily in habitats along
rivers. However, little is known about habitat occupancy over time and how seasonal …

Avian species are in rapid decline worldwide, with 1 in 8 species facing extinction, and in
North America shorebird species are declining at a higher proportion than other groups. The …

Tropical birds are usually placed in the “slow” end of the life-history continuum, and much of
their physiology matches the trade-off between lifespan and reproduction. For example, they …

ABSTRACT The Brown-headed Cowbird (Molothrus ater) is a well-known obligate brood
parasite that spread northward into California's Sacramento Valley in the 1930s, supported …

MÉTODOS El presente estudio fue realizado del 21 al 26 de mayo de 2022, en época de
invierno, registrando las aves vistas en caminatas y capturadas en redes. En la zona del …