Results 201 to 210 of about 44,579 (279)

Bergmann's rule: Why does body size increase with latitude?

Functional Ecology, Volume 40, Issue 4, Page 830-843, April 2026.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Bergmann's rule describes the tendency for endothermic body size to increase with latitude, a pattern often attributed to climatic factors. However, the underlying developmental and evolutionary mechanisms remain debated.
Kurt M. Ongman, Carl G. Lundblad, Courtney J. Conway   +2 more
wiley   +1 more source

Chronic stress and fear in fast- and slow-growing broilers as they age and gain weight when raised in simple or complex environments. [PDF]

Poult Sci
Ulans A, Moore IT, Jacobs L.
europepmc   +1 more source

Challenges in population monitoring: Bar‐tailed Godwits (Limosa lapponica) on the East Atlantic Flyway defy assumed population structure

Ibis, Volume 168, Issue 2, Page 824-832, April 2026.
Estimating and monitoring migratory bird populations involves significant challenges, even in the most well‐studied and easily‐counted species, and can be further complicated by long‐held but unverified assumptions and by shifting distributions in changing flyway conditions.
Jesse R. Conklin, Roeland A. Bom, Åke Lindström, Pierrick Bocher, Theunis Piersma   +4 more
wiley   +1 more source

Differences between Scaly-sided Merganser (Mergus squamatus) and Common Merganser (M. merganser) feather microstructure. [PDF]

PLoS One
Li D, Zhang S, Tian R, Zhao Y, Yi G.
europepmc   +1 more source

A New Helical Crossed-Fibre Structure of β-Keratin in Flight Feathers and Its Biomechanical Implications

, 2013
Theagarten Lingham‐Soliar, Nelisha Murugan   +1 more
openalex   +2 more sources

Field‐based evidence of impaired sperm quality associated with conventional farming in two passerine birds

Ibis, Volume 168, Issue 2, Page 504-519, April 2026.
The detrimental effects of conventional farming on bird biodiversity are increasingly documented. Despite this, the specific impacts of both organic and conventional farming practices on bird coloration and sperm quality in natural settings remain unexplored. This study aimed to determine whether these farming practices differentially affect body mass,
Ségolène Humann‐Guilleminot, Audrey Bailly, Karine Monceau, Mélissa Desbonnes, Vincent Bretagnolle, Jérôme Moreau   +5 more
wiley   +1 more source

Research note: Effects of scalding on feather corticosterone concentrations in broiler chickens. [PDF]

Poult Sci
Vitek S, Ulans A, Jacobs L.
europepmc   +1 more source

Supplementary material from "Flight, symmetry and barb angle evolution in the feathers of birds and other dinosaurs"

, 2019
Julia A. Clarke, Tang, Ho Kwan, Clarke, Julia A.   +2 more
openalex   +1 more source

A new species of jewel‐babbler (Cinclosomatidae: Ptilorrhoa) from the Southern Fold Mountains of Papua New Guinea

Ibis, Volume 168, Issue 2, Page 431-450, April 2026.
Based on distinctive morphological and vocal characters we describe a new species of jewel‐babbler (genus Ptilorrhoa) from the forested karst of the Southern Fold Mountains in Papua New Guinea. The description is based on camera trap data and is presented in accordance with ICZN Declaration 45.
Iain A. Woxvold, Banak G. Gamui, Leo Legra, Samson Yama, Bonny Koane, Salape Tulai   +5 more
wiley   +1 more source

Medulla-free barb rami highlight the morphological diversity of early feathers. [PDF]

Zool Res
Zhang YY, Tang JW, Wang Y, Wang S.
europepmc   +1 more source