Mammal
A mammal or mammalian was a type of endothermic animal characterized by the presence of mammary gland on females, fur or hair on the skin, a neocortex, and three middle ear bone. 

Sixty-five million years ago, a comet hit caused mass extinction to most reptiles on Earth, which allowed the eventual rise of mammals as the dominant species. ()

In Doctor Gillian Taylor's presentation, "The Wonderful World of Whales", she explained that "the first commonly held misconception is that whales are fish. They're not, they're mammals just like you and me. Warm-blooded, needing air to breathe and producing milk to nurse their young." ()

When  explained to the Kantare female, Liana, what a dog was, in 2151 – as it was not a word in her language – he described it as "a mammal, [with] four legs, big ears, kind of cute." ()

When the  first visited the Shore Leave Planet in 2267, the ship's instruments indicated that there was no animal life on the planet whatsoever. Despite this, Doctor Leonard McCoy thought for certain that he saw a White Rabbit, and even later reiterated to the captain that sensors indicated that there were "No birds, no mammals, no insects, nothing," on the planet. ()

By the 24th century, the Voth, a  race formally from Earth, had very poor relations with non-Saurian races. Mammals in particular were considered to be a lower lifeform. So when Professor Forra Gegen found strong leads into proving the Distant Origin Theory,  in 2373, following the discovery of "a race of bipedal endotherms," later determined to be Humans, Haluk scoffed at the idea that the Voth were related to a mammalian species. 

Later, after the Voth Tova Veer was captured aboard , Chakotay, who was in turn with the Voth, suggested to Gegen that they should return to Voyager, on account of "Veer is probably sick of the mammalian food by now." ()

Orders

Marsupialia (Marsupials) 

Kangaroo
Koala
Altarian marsupial
Vulcan marsupial
Xindi-Arboreal

Chiroptera (Bats) 

Andorian redbat
Bajoran bat
Kavarian tiger-bat
Pyrithian bat
Sand bat
Tiberian bat
Vampire bat

Eulipotyphla (Insectivores) 

Hedgehog

Primates

Terrestrial
Australopithecine
Chimpanzee
Gorilla
Human
Lemur
Neanderthal
Pygmy marmoset
Extraterrestrial
Anthropoid ape
Denobulan lemur
Mugato
New Earth primate

Xenarthra

Sloth
Alvanian cave sloth
Armadillo
Digger

Lagomorpha

Jackrabbit
Rabbit

Rodentia (Rodents)

Cardassian vole
Fox squirrel
Ground squirrel
Guinea pig
 Marmot
Xanthan marmot
Mouse
Rat

Cetacea

Baird's beaked whale (Berardius bairdi)
Blue whale (Balaenoptera musculus)
Cuvier's beaked whale (Ziphius cavirostris)
Denebian whale
Dolphin
Bottlenose dolphin (Tursiops truncatus)
Pink dolphin (Inia geoffrensis)
False killer whale (Pseudorca crassidens)
Fin whale (Balaenoptera physalus)
Gray whale (Eschrichtius robustus)
Humpback whale (Megaptera novaeangliae)
Killer whale (Orcinus orca)
Minke whale (Balaenoptera acutorostrata)
Pygmy sperm whale (Kogia breviceps)
Sei whale (Balaenoptera borealis)
Sperm whale (Physeter macrocephalus)

Carnivora

Bear
Black bear
Polar bear
Saber bear
Yar-bear
Bobcat
Cat
Coyote
Dog
Ermine
Fox
Jackal
Lion
Mink
Mountain lion
Raccoon
Seal
Skunk
Teneebian skunk
Tiger
Bengal tiger
Saber-toothed tiger
Weasel
Wolf

Proboscidea (Elephants)

Elephant
Mammoth
Algorian mammoth
Plygorian mammoth
Woolly mammoth
Mastodon
Ligorian mastodon

Perissodactyla

Donkey
Horse
Pony
Rhinoceros
Screech rhino
White rhinoceros
Zebra

Artiodactyla

Cattle 
Cow / Bull 
Andorian bull
Ox
Rigellian ox
Buffalo
Camel
Deer
Elk
Gazelle
Giraffe
Goat
Degebian mountain goat
Hippopotamus
Kudu
Llama
Moose
Bardakian pronghorn moose
Pig
Sheep
Water buffalo
Wild boar
Wildebeest
Kelaran wildebeest
Takaran wildebeest
Yak
Yridian yak

External link

Lifeform classifications
de:Säugetier