Results 21 to 30 of about 142 (68)
A new enigmatic Late Miocene mylodontoid sloth from northern South America [PDF]
Royal Society Open Science, 2015 A new genus and species of sloth (Eionaletherium tanycnemius gen. et sp. nov.) recently collected from the Late Miocene Urumaco Formation, Venezuela (northern South America) is herein described based on a partial skeleton including associated femora and ...
Ascanio D. Rincón +4 more
doaj +1 more source
Fecal estradiol and progesterone metabolite levels in the three-toed sloth (Bradypus variegatus) [PDF]
Brazilian Journal of Medical and Biological Research, 2006 The present study was carried out to assess the possibility of measuring fecal steroid hormone metabolites as a noninvasive technique for monitoring reproductive function in the three-toed sloth, Bradypus variegatus.
M. Mühlbauer +3 more
doaj +1 more source
Why sloths defecate on the ground: rejection of the mutualistic model
Cuadernos de investigación UNED, 2021 Introduction: Sloths are arboreal mammals that defecate on the ground, increasing the risk of predation. There are several hypotheses that try to explain why they undergo this risk.
Julian Monge Nájera
doaj +1 more source
The metabolic response of the Bradypus sloth to temperature [PDF]
PeerJ, 2018 Poikilotherms and homeotherms have different, well-defined metabolic responses to ambient temperature (Ta), but both groups have high power costs at high temperatures.
Rebecca Naomi Cliffe +5 more
doaj +2 more sources
Evolutionary Applications, 2020 Sloths are notoriously slow and consequently have limited dispersal ability, which makes them particularly vulnerable to the effects of habitat fragmentation and degradation. Sloths in Costa Rica are considered of conservation concern due to habitat loss,
Rebecca N. Cliffe +6 more
doaj +1 more source
Disparity of turbinal bones in placental mammals
The Anatomical Record, EarlyView.Abstract Turbinals are key bony elements of the mammalian nasal cavity, involved in heat and moisture conservation as well as olfaction. While turbinals are well known in some groups, their diversity is poorly understood at the scale of placental mammals, which span 21 orders.
Quentin Martinez +11 more
wiley +1 more source
Genomic data suggest parallel dental vestigialization within the xenarthran radiation
Peer Community Journal, 2023 The recent influx of genomic data has provided greater insights into the molecular basis for regressive evolution, or vestigialization, through gene loss and pseudogenization.
Emerling, Christopher A +8 more
doaj +1 more source
Intraspecific variation of cochlear morphology in bowhead and beluga whales
The Anatomical Record, EarlyView.Abstract The bony labyrinth of the petrosal bone, a distinctive feature of mammal skulls, is often identified in micro‐computed tomography imaging to infer species' physiological and ecological traits. When done as part of a comparative study, one individual specimen is normally considered representative of a species, and intraspecific variation is ...
John Peacock, J. G. M. Thewissen
wiley +1 more source
BMC Evolutionary Biology, 2010 Background Sloths are slow-moving arboreal mammals inhabiting tropical rainforests in Central and South America. The six living species of sloths are occasionally reported to display a greenish discoloration of their pelage.
Chiarello Adriano G +7 more
doaj +1 more source
Parallel evolution of reduced cancer risk and tumor suppressor duplications in Xenarthra
eLife, 2022 The risk of developing cancer is correlated with body size and lifespan within species, but there is no correlation between cancer and either body size or lifespan between species indicating that large, long-lived species have evolved enhanced cancer ...
Juan Manuel Vazquez +5 more
doaj +1 more source