Wikipedia:WikiProject Mammals
This page is not so much a project policy page as a means of getting a handle on how much of the mammals Wikipedia covers. Right now policy is covered by Grandmother project Wikipedia:WikiProject Tree of Life, sister project Wikipedia:WikiProject Birds, and children projects Wikipedia:WikiProject Primates, Wikipedia:WikiProject Cetaceans and Wikipedia:WikiProject Dog breeds.
Classification taken from the Mammal article which in turn was taken from the classic classification by Simpson (no end of possible controversy here possible).
Order, Size, Depth of coverage, Appropiateness of coverage (requires an expert in the field to judge, I guess)
Monotremata, Platypus and spiny anteaters, 4 species in 2 families, One article for each family, covering each species
Didelphimorphia, common opossums, about 30 species in one family, article covering the whole family
Paucituberculata, shrew opossums, 5 species in one family, article covering the whole family
Microbiotheria, the "Monito del Monte" - one species with an article
Dasyuromorphia, carnivorous marsupials - 56 species in two families, mixed coverage?
Peramelemorphia, bandicoots bilbies, 21 species in three families, coverage at subfamily level (3? articles)
Notoryctemorphia, marsupial mole, 2 species in one family, single article
Diprotodontia, kangaroos, wallabies, possums, wombats, koala, 120 species in ???, mixed coverage?
Afrosoricida, golden moles and tenrecs, otter shrews, 54 species in 2 families,
Macroscelidea, elephant shrews, 15 species in 1 family, 1 article
Tubulidentata, the aardvark, 1 species, Good article
Hyracoidea, Hyraxes, 11 species in 3 genera, 1 family, 1 article
Proboscidea, Elephants, 3 species in 1 family, 3 articles, two very stubbish
Sirenia, Seacows and manatees, 5 species in 2 families, mixed
Xenarthra, Anteaters, sloths, armadillios, 30 species in 4 families, mixed
Dermoptera, Colugos (flying lemurs) 2 species in one family. Good article
Desmostylia, extinct herbivorous marine mammals, more to add
Scandentia, tree shrews, 18 species in 6 genera, 1 family, more to add
Primates, people etc :), about 300 species in 12 families, Active WikiProject, ???
Rodentia, Lots of rats, guinea pigs, squirrels, hamsters, gerbils, 2000-3000 species in lots of genera, could be a big topic
Lagomorpha, Rabbits, hares and pikas, ~80 species in two families, overview article
Insectivora, Shrews, hedgehogs, moles, moonrats , four families, 312 species in one of the families, ??? in the other three, mixed coverage
Chiroptera, Bats, Many families (??? species), different style article, mixed coverage
Pholidota, Pangolins, 7 species in 1 genus, One nice article
Carnivora (inc. Pinnipedia) Dogs, Raccoons, Bears, Weasels, Skunks, Cats, Civets, Mongeese, Hyenas, Seals, Walrus, ~265 species in 12 families, Mixed coverage, Plenty of excellent articles (inc. a whole project on Dog Breeds)
Perissodactyla Horses, tapirs and rhinos, 15 species in 3 families
Artiodactyla Pigs, hippos, peccaries, camels, deer, giraffe, pronghorn, cattle, sheep, goats, okapi, chevrotains 220 species in 10 families
Cetacea 86 species in ~20 genera, Active WikiProject, Articles to genus or species level of mixed quality, some more general coverage