The evolution of mammals has passed through many stages since the first appearance of their synapsid ancestors in the Pennsylvanian sub-period of the...

Monotremes (/ˈmɒnətriːmz/) are mammals of the order Monotremata. They are the only known group of living mammals that lay eggs, rather than bearing live...

"Condylarths: Archaic hoofed mammals" in Paleocene mammals of the world Savage, RJG, & Long, MR (1986). Mammal Evolution: an illustrated guide. New York:...

palate of marsupials contains more openings compared to placental mammals. Teeth in marsupials also differ significantly from those in placental mammals. For...

as well. Mammals portal Cetaceans portal Evolutionary biology portal Paleontology portal Aquatic adaptation Evolution of mammals Evolution of sirenians...

prostate evolution in monotreme mammals. Testicular descent occurs to a variable degree in various mammals, ranging from virtually no change of position...

and lower jaws contain several bones not found in mammals. Over the course of the evolution of mammals, one bone from the lower and one from the upper jaw...

A mammal (from Latin mamma 'breast') is a vertebrate animal of the class Mammalia (/məˈmeɪli.ə/). Mammals are characterized by the presence of milk-producing...

bi-pedal and quadrupedal locomotion. Evolution of mammals List of fossil primates Primate#Evolution Timeline of human evolution Maxwell 1984, p. 296 Rui Zhang;...

of similar placental and marsupial forms is described by Richard Dawkins in The Blind Watchmaker as a case of convergent evolution, because mammals on...

(thēríon) 'wild beast') is a subclass of mammals amongst the Theriiformes. Theria includes the eutherians (including the placental mammals) and the metatherians (including...

fossils of Echinerpeton and perhaps an even earlier genus, Protoclepsydrops, representing just one of the many stages in the evolution of mammals, in contrast...

domesticated mammals, domesticated cat breeds have very few genetic differences from their wild counterparts due to constant intermixing, with thousands of years...

Handbook of the Mammals of the World, Volume 1: Carnivora. Barcelona: Lynx Ediciones. pp. 50–658. ISBN 978-84-96553-49-1. Barycka, E. (2007). "Evolution and...

relatives. They are the only extant herbivorous marine mammals and the only group of herbivorous mammals to have become completely aquatic. Sirenians are thought...

The evolution for semelparity in both sexes has occurred many times in plants, invertebrates, and fish. It is rare in mammals because mammals have obligate...

The monotremes (egg laying mammals) represent the order of extant mammals most distantly related to humans. The platypus (Ornithorhynchus anatinus) is...

physiology, and most mammals are still nocturnal. Mammals evolved from cynodonts, a group of superficially dog-like synapsids in the wake of the Permian–Triassic...

clade composing of a major group of eupelycosaurian synapsids that includes mammals and their ancestors and close relatives. Many of the traits today...

Marine mammals are mammals that rely on marine (saltwater) ecosystems for their existence. They include animals such as cetaceans (whales, dolphins and...

semiaquatic mammals are a diverse group of mammals that dwell partly or entirely in bodies of water. They include the various marine mammals who dwell in...

elephants and kangaroos are unusual among mammals because they are polyphyodonts, in contrast to most other mammals which replace their teeth only once in...

develops within the parent). It is typical for mammals, but also occurs for some non-mammals. Mammals during pregnancy can have one or more gestations...

group of semiaquatic marine mammals which is closely related to an extinct group of pinnipeds, Enaliarctos. While support for the monophyly of pinnipeds...

Sphenacodontidae Order Therapsida Evolution of mammals List of pelycosaurs Vertebrate paleontology Cope, E. D. (1878). "Descriptions of extinct Batrachia and Reptilia...

"mammal-like reptiles" is incorrect under the new definition of "reptile", so they are now referred to as stem mammals, and sometimes as proto-mammals...

small mammals. Thus, the large mammal tend have longer gestation periods than small mammal as they tend to produce larger neonate. Large mammals require...

absorbing it, as most mammals do. The reason is likely related to differences in the ovulation process. Most female placental mammals have a uterine lining...

with the other groups of marine mammals such as cetaceans and pinnipeds). In addition to their similarity with Laurasian mammals in North America, Europe...

Walker's Mammals of the World. 6th edition. Johns Hopkins University Press, Baltimore 1999, ISBN 0-8018-5789-9. Thomas S. Kemp: The Origin & Evolution of Mammals...