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 group of living mammals that lay eggs, rather than bearing live young...

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

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

Marine mammals are mammals that rely on marine ecosystems for their existence. They include animals such as cetaceans, pinnipeds, sirenians, sea otters...

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

Z, Cifelli RL (2004). "Chapter 3: Origin of mammals". Mammals from the age of dinosaurs: origins, evolution, and structure. New York: Columbia University...

Davis, R. W. 2019. Return to the Sea: The Evolution of Marine Mammals. Pages 7–27 in R. W. Davis, ed. Marine Mammals: Adaptations for an Aquatic Life. Springer...

diverse group of mammals belonging to the infraclass Marsupialia. They are natively found in Australasia, Wallacea, and the Americas. One of marsupials'...

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

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

"reptile", so they are now referred to as stem mammals, proto-mammals, paramammals or pan-mammals. Most lineages of pelycosaur-grade synapsids were replaced...

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

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

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...

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

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

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

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

linked to dietary habits, specifically those of insectivorous mammals. Myrmecophagous mammals, mammals which primarily eat ants and termites, typically...

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

humans and close relatives such as chimpanzees. Females of other species of placental mammals undergo estrous cycles, in which the endometrium is completely...

group of eupelycosaurian synapsids that includes mammals and their ancestors and close relatives. Many of the traits today seen as unique to mammals had...

other mammals. (Their function in non-placental mammals is to stiffen the body during locomotion, but in placentals they would inhibit the expansion of the...

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

concretions, and made unprecedented finds documenting the rise and early evolution of mammals. Scholia has a profile for Tyler Lyson (Q7860071). Carroll, Sean...

Southern Hemisphere. The extinction of many groups allowed mammals and birds to greatly diversify so that large mammals and birds dominated life on Earth...

further removed from crown group mammals than Hadrocodium, had two layers of fur, guard hairs and underfur, as do mammals today. It is possible that early...

around 50,000 years ago onwards, most large mammal species became extinct, including 80% of all mammals greater than 1,000 kilograms (2,200 lb), while...

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...