Results 31 to 40 of about 753 (160)
Palaeognath birds innovate to solve a novel foraging problem [PDF]
Scientific ReportsThe ability to innovate implies flexible cognition, and is used as a broad metric of intelligence. Innovation in birds has been intensively studied in the larger and more taxonomically diverse Neognathae clade (particularly crows and parrots) and ...
Fay E. Clark +3 more
doaj +2 more sources
Avian interferon regulatory factor (IRF) family reunion: IRF3 and IRF9 found [PDF]
BMC BiologyBackground Interferon regulatory factors (IRFs) are a family of transcription factors with important functions in immunity. The genomes of most vertebrates encode ten IRF genes.
Lenka Ungrová +13 more
doaj +2 more sources
Ultraviolet light illuminates species-specific biofluorescent casque patterns in cassowaries (Casuarius) [PDF]
Scientific ReportsCassowaries possess prominent keratinous and bony cranial ornaments, called casques, which have been suggested to function in visual signaling. Despite possessing vividly colored head and neck skin, casque keratin appears dull, which has abated the ...
Todd L. Green +4 more
doaj +2 more sources
Zootaxa, 2015 FIGURE 4. Lithornis vulturinus Owen, 1840 (MGUH 26770), Early Eocene of Denmark, skull in right lateral view. Anatomical abbreviations: aj, arcus jugalis; an, apertura nasi ossea; cc, caudal convexity of lacrimale; cq, cotyla quadratojugalis; dz, small ...
Lindow, Bent Erik Kramer +2 more
core +5 more sources
Evidence of a true pharyngeal tonsil in birds: a novel lymphoid organ in
Frontiers in Zoology, 2012 Background Tonsils are secondary lymphoid organs located in the naso- and oropharynx of most mammalian species. Most tonsils are characterised by crypts surrounded by dense lymphoid tissue. However, tonsils without crypts have also been recognised.
Crole Martina R, Soley John T
doaj +4 more sources
Insights into avian molecular cytogenetics—with reptilian comparisons [PDF]
Molecular CytogeneticsIn the last 100 years or so, much information has been accumulated on avian karyology, genetics, physiology, biochemistry and evolution. The chicken genome project generated genomic resources used in comparative studies, elucidating fundamental ...
Darren K. Griffin +5 more
doaj +2 more sources
Ontogenetic scaling patterns and functional anatomy of the pelvic limb musculature in emus (Dromaius novaehollandiae) [PDF]
PeerJ, 2014 Emus (Dromaius novaehollandiae) are exclusively terrestrial, bipedal and cursorial ratites with some similar biomechanical characteristics to humans. Their growth rates are impressive, as their body mass increases eighty-fold from hatching to adulthood ...
Luis P. Lamas +2 more
doaj +2 more sources
Peer Community Journal, 2021 Crown birds are subdivided into two main groups, Palaeognathae and Neognathae, that can be distinguished, among other means, by the organization of the bones in their pterygoidpalatine complex (PPC).
Plateau, Olivia, Foth, Christian
doaj +1 more source
Bone histology, phylogeny, and palaeognathous birds (Aves: Palaeognathae) [PDF]
Biological Journal of the Linnean Society, 2014 The presence of a phylogenetic signal in the variation of osteohistological features has been recently debated in the literature. Previous studies have found a significant signal for some features, but these results were obtained on a small amount of characters and a reduced sample.
Legendre, Lucas +6 more
openaire +4 more sources
Publicación Electrónica de la Asociación Paleontológica Argentina, 2023 “The present state of knowledge of the Cenozoic birds of Argentina” published in Contributions in Sciences in 1980, written by the argentine paleontologist Eduardo Pedro Tonni, became a must-read for those interested in the record of fossil birds.
Claudia P. Tambussi +2 more
doaj +1 more source