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Hace 5 días · Learn how animals are divided into six broad categories, from spineless invertebrates to complex mammals. Find out the characteristics and examples of each group, from fish to birds to humans.
Hace 5 días · Primate, in zoology, any mammal of the group that includes the lemurs, lorises, tarsiers, monkeys, apes, and humans. The order Primates, including more than 500 species, is the third most diverse order of mammals, after rodents (Rodentia) and bats (Chiroptera).
Hace 1 día · Vertebrates (/ ˈ v ɜːr t ə b r ɪ t s,-ˌ b r eɪ t s /) are deuterostomal animals with bony or cartilaginous axial endoskeleton — known as the vertebral column, spine or backbone — around and along the spinal cord, including all fish, amphibians, reptiles, birds and mammals.
Hace 19 horas · Around 100 million years ago, a remarkable evolutionary shift allowed placental mammals to diversify and conquer many cold regions of our planet. New research from Stockholm University shows that ...
Hace 19 horas · Marsupials have the typical characteristics of mammals —e.g., mammary glands, three middle ear bones, (and ears that usually have tragi, [3] varying in hearing thresholds [4]) and true hair. [5] There are, however, striking differences as well as a number of anatomical features that separate them from eutherians .
Hace 5 días · The polar bear travels long distances over vast desolate expanses, generally on drifting oceanic ice floes, searching for seals, its primary prey. The polar bear is the largest and most powerful carnivore on land, a title it shares with a subspecies of brown bear called the Kodiak bear.
Hace 19 horas · In mammals, the evolution of UCP1-mediated thermogenesis likely involved two steps. First ( 1 ), adipose tissue was rewired to link cold stress to expression of nonthermogenic UCP1. Second ( 2 ), UCP1 acquired thermogenic function only after eutherian mammals diverged from marsupials. Although SERCA-based NST also occurs in most mammals ( 5 ...
