Mammals, like humans, have a rigid rib cage.
A mammal is a member of the Mammalia animal class and includes many familiar creatures, including humans. There are over 5,000 species, most of which live on land, except for a few species such as dolphins, whales, and manatees. A mammal can be recognized by a number of unique characteristics, which include the following:
Mammary glands. A mammal can produce milk to feed its young, unlike other species, which feed their young solid food. The young are born alive, except for a few species, such as species in the order of monotremes, which lay eggs. Hot blood. Animals in this class are warm-blooded, which helps them maintain a stable body temperature. They also have a four-chambered heart, a unique feature that allows the lungs to receive oxygenated blood in adequate amounts. These animals have bodies that are all covered in some sort of fur or fur that helps preserve heat, and even aquatic mammals have fur at some point in their lives. neocortex. A mammal has a section of the brain that is not found in any other animal class. The neocortex is the section that controls language, motor commands, and conscious thought. Although birds and certain reptiles seem capable of experiencing some of these traits, the neocortex is still unique to mammals. Size. Mammals have the biggest difference between the smallest (bats) and largest (blue whales) species: 53 million times. No other animal even comes close in comparison. Skeleton. Animals in this class have fewer bones than other animal classes; they also have a rigid rib cage, solid hip attachments, specialized adapted teeth, streamlined limbs, and increased brain cage size. Adipose tissue. Mammals have a higher percentage of fat deposits than any other animal class; this helps them with energy storage and thermal insulation. A mammal can survive longer without food or water than any other species on Earth.