Results 41 to 50 of about 1,970 (176)
The mechanism of labor in nonhuman primates: A look inside
The Anatomical Record, EarlyView.Abstract While in humans, the flexed position of the fetus and its rotating course down the birth canal are well documented, in other primates the mechanism of labor is unknown. Despite the lack of comparative data, it is commonly assumed that the human obstetric mechanism is unique, and anthropologists have disputed when and why the transition to the ...
Melissa K. Stoller
wiley +1 more source
Molecular data highlight hybridization in squirrel monkeys (Saimiri, Cebidae)
Genetics and Molecular BiologyHybridization has been reported increasingly frequently in recent years, fueling the debate on its role in the evolutionary history of species. Some studies have shown that hybridization is very common in captive New World primates, and hybrid offspring ...
Jeferson Carneiro +3 more
doaj +3 more sources
Humans are not unique: difficult birth is common in placental mammals
Biological Reviews, EarlyView.ABSTRACT Human childbirth is widely presumed to be uniquely difficult and dangerous compared to birth in other mammals. Tight fetopelvic proportions can result in obstructed labour and contribute to high rates of maternal and neonatal mortality. Ideas summarised under the ‘obstetrical dilemma’ have contributed to this assumption by explaining difficult
Nicole D. S. Grunstra
wiley +1 more source
From armadillos to sloths: Patterns and variations in xenarthran coronary anatomy
The Anatomical Record, Volume 309, Issue 8, Page 2199-2220, August 2026.Abstract Species of the superorder Xenarthra play a vital ecological role in the Neotropics. Despite their evolutionary significance, anatomical studies on their coronary circulation remain scarce. This study investigated the coronary anatomy of 82 hearts from nine Xenarthra species across the Dasypodidae, Myrmecophagidae, and Bradypodidae.
Wilson Viotto‐Souza +5 more
wiley +1 more source
Primatas do Parque Nacional do Viruá, Roraima, Brasil
Biodiversidade Brasileira, 2018 Este trabalho apresenta o inventário consolidado de primatas do Parque Nacional do Viruá, Roraima, feito a partir da revisão da literatura e consulta ao material tombado nas coleções do Instituto Nacional de Pesquisas da Amazônia e do Museu Paraense ...
Renata Bocorny de Azevedo +5 more
doaj +3 more sources
Journal of Medical Primatology, Volume 55, Issue 3, June 2026.ABSTRACT Background Toxoplasmosis and leishmaniosis are zoonotic diseases that affect several species of neotropical primates. Methods Three black lion tamarins (Leontopithecus chrysopygus) kept at a Brazilian zoo died due to a superacute disease.
Acauane Sehnem Lima +11 more
wiley +1 more source
Magnetic Resonance in Medicine, Volume 95, Issue 5, Page 2786-2796, May 2026.ABSTRACT Purpose Dorsal rhizotomy, or spinal dorsal nerve root lesioning, is a surgical procedure used to treat intractable nerve pain by selectively severing sensory afferent nerve roots. This study aimed to evaluate whether multiparametric MRI, including diffusion tensor imaging (DTI), quantitative magnetization transfer (qMT), chemical exchange ...
Feng Wang, John C. Gore, Li Min Chen
wiley +1 more source
A comparison of personality in the common and Bolivian squirrel monkey (Saimiri sciureus and Saimiri boliviensis). [PDF]
Journal of Comparative Psychology, 2018 Personality has been studied in all of the great apes, many Old World monkey species, but only a handful of New World monkey species. Because understanding the personalities of New World monkeys is crucial to understanding personality evolution in primates, we used the Hominoid Personality Questionnaire to assess personality in 55 common squirrel ...
Wilson, Vanessa A.D. +2 more
openaire +4 more sources
Gestural Sequences in Wild Spider Monkeys (Ateles geoffroyi)
American Journal of Primatology, Volume 88, Issue 4, April 2026.Geoffroy's spider monkeys produce gestural sequences in the wild, mostly during aggressive, playful and sexual interactions. ABSTRACT To date, research on gestural communication in species other than great apes has been quite limited, especially in their natural habitat, although including a broader range of species in different settings is essential ...
Eva Corral +4 more
wiley +1 more source
Partner Choice and Context‐Dependent Sex Differences in Rat Rough‐and‐Tumble Play
European Journal of Neuroscience, Volume 63, Issue 3, February 2026.When given partner choice in triadic play, male rats showed a robust preference for female partners, whereas females formed partner preferences that were not sex specific. Females initiated less play in mixed‐sex groups but played at male‐typical levels in all‐female groups, demonstrating that sex differences in rough‐and‐tumble play arise both from ...
Jackson R. Ham +2 more
wiley +1 more source