Mammal . "Mammalian" redirects here. For the 2022 documentary film, see Mammalian (film). There are more mammal species than we thought; Over 300 mammal species , Some mammal species are used as a means of transport, while others are used for pest control, or for financial gain. The wool of some mammals, such as sheep, goats, and alpacas, are used as the base material in clothing production. The skins of other mammals, such as cattle, provide leather for upholstery, clothing, and accessories., The duck-billed platypus is an aquatically adapted mammal that first appeared more than 110 it is an endangered species with only 5,000 remaining. Dwelling in forests and burrows, the Amami , Secondly, mosquitos are far more prominent an animal than people assume. Killing them would have unimaginable destructive consequences on the ecosystem. There are ~5000 mammal species alive today. There are ~3000 mosquito species alive today., There are more than 4,000 species of mammals, which taxonomists classify into different groups based on characteristics like their body structure, the number and type of bones, and the number and arrangement of teeth., .