ថនិកសត្វ

ដោយវិគីភីឌា


ថនិកសត្វ
របាយកាល: Middle Jurassic - Present, 167.7–0Ma
But see text
Examples of various mammalian orders, click the image and scroll down for individual descriptions
ចំណាត់ថ្នាក់ជីវ​សាស្ត្រ e
Kingdom: Animalia
Phylum: Chordata
Superclass: Tetrapoda
Clade: Amniota
Clade: Mammaliaformes
Class: Mammalia
Linnaeus, 1758
Subgroups

Mammals (class Mammalia (play /məˈmli.ə/)) are a clade of warm-blooded amniotes. Among the features that distinguish them from the other amniotes, the reptiles and the birds, are hair, three middle ear bones, mammary glands in females, and a neocortex (a region of the brain). The mammalian brain regulates body temperature and the circulatory system, including the four-chambered heart. The mammals include the largest animals on the planet, the rorqual whales, as well as some of the most intelligent such as elephants as well as some primates and cetaceans. The basic body type is a four-legged land-borne animal, but some mammals are adapted for life at sea, in the air, in the trees, or on two legs. The largest group of mammals, the placentals, have a placenta which feeds the offspring during pregnancy. Mammals range in size from the 30–40 millimeter (1- to 1.5-inch) bumblebee bat to the 33-meter (108-foot) blue whale.