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Mammalian refers to a class of warm-blooded vertebrates that possess hair or fur on their bodies, produce milk to feed their young, and have a complex brain. Mammals are further classified into various orders such as primates, rodents, carnivores, and cetaceans, to name a few. They are found in almost every part of the world, from the tundra of the Arctic to the tropical regions of the equator.

One of the most defining features of mammals is their ability to regulate their body temperature internally. They are also known to have a four-chambered heart, lungs that exchange gases efficiently, and a diaphragm that aids in breathing. Additionally, they have a highly evolved nervous system, which is responsible for their advanced communication, perception, and cognitive abilities.

Mammals have a wide range of adaptations that have enabled them to survive in diverse environments. For instance, some mammals have developed thick layers of fat or fur to protect them from extreme cold, while others have streamlined bodies that help them swim efficiently in the water. There are also mammals that have evolved to have long necks to reach vegetation on tall trees, or powerful jaws and sharp teeth for hunting prey.

Mammals are also known for their varied social behaviors, which include the formation of family groups, communication through sound or body language, and the use of tools to obtain food or defend themselves. They have also developed a unique way of reproducing, which involves internal fertilization, gestation, and breastfeeding. This has allowed mammals to have a closer bond with their offspring and a greater chance of survival.

Despite their diverse adaptations and behaviors, mammals share a common ancestor that lived millions of years ago. Through evolution, they have become one of the most successful and dominant groups of animals on the planet. However, some mammals are at risk of extinction due to habitat loss, climate change, overhunting, and other human activities. Therefore, it is essential to conserve their habitats and protect them from harm to ensure their survival for future generations.