Information on the Animal Class Mammals
What are Mammals?
Characteristics and Unique Features of Mammals:
- Vertebrates: Mammals possess a solid skeletal structure made of bones within their bodies.
- Constant temperature: Their bodies consistently strive to maintain the same temperature, regardless of external conditions.
- Hair and fur: Mammals are the only animals that have true fur or hair.
- Live young: Nearly all mammals give birth to live young (they do not lay eggs).
- Mother's milk: Mothers nourish their babies with milk produced in their bodies.
- Four-legged: Almost all mammals have four legs.
Mammal Family Tree
The Evolution of Mammals
About 200 million years ago, the first mammals existed on our planet. However, they were quite small at that time. It was only after the dinosaurs went extinct that they had enough space to evolve and adapt (without being eaten by the dinosaurs first).
Habitat
Where Can Mammals Be Found?
Mammals are true survivors and have inhabited nearly every corner of the planet. You can find them:
- On land (terrestrial species)
- Underground (burrowing species)
- In water (marine mammals)
- In the air (flying mammals)
Diet
What Do Mammals Eat?
The dietary habits of mammals are incredibly diverse. There are:
- Herbivores (plant-eaters)
- Carnivores (meat-eaters)
- Omnivores (eaters of both plants and animals)
Interestingly, the largest land mammals are herbivores (like elephants or giraffes), even though they feed solely on vegetation. To meet their energy needs, they must consume food almost continuously. In contrast, predators are adapted to hunt larger meals and can go for extended periods without eating.
Movement
How Do Mammals Move?
Mammals exhibit such a variety of body structures that they can master nearly every form of movement. They can:
- swim
- crawl
- jump
- dive
- climb
- fly
- run
Reproduction
How Do Mammals Reproduce?
Mammals give birth to live young, which develop inside the womb (except for the egg-laying mammals, the platypus and the echidna).
Intelligence
Mammals are the most advanced of all animal species. Their brains – particularly the cerebrum – are significantly more developed than those of other animals. While they do not think like humans, they possess the ability to learn and control their actions.
How Do Mammals Differ From Other Animals?
To clearly distinguish mammals from other animal species, the following characteristics are helpful:
They Nurse Their Young
Does the animal have a udder or nipples? If so, it is a mammal. As the name implies, the offspring are nursed. The mother's milk is produced in the milk glands of the udder, providing the young with all the essential nutrients.
They Give Birth to Live Young
With a few exceptions, mammals are the only ones that give birth to live young (except for the platypus and the echidna).
They Are Four-Legged
Even though it may not always be obvious at first glance: Essentially, all mammals are four-legged. Throughout their evolution, the limbs of some animal species have changed significantly to adapt to their environment:
- Wings for flying: instead of hands and arms in bats
- Flippers and tail fins: instead of arms and legs in whales and dolphins
They Have Hair and Fur
Birds have feathers, snakes have scales, and beetles have shells – but only mammals have hair. This helps maintain a relatively constant body temperature in both heat and cold. Even domestic pigs and whales have hair - though it is very short and fine.
Species
There are about 6,600 species of mammals:
| Rodents: | 2,500-2,600 |
| Bats: | 1,400 |
| Insectivores: | 450 |
| Primates: | 500 |
| Marsupials: | 320 |
| Animals of prey: | 280 |
| Hoofed animals: | 290 |
| Toothed/baleen whales: | 90 |
| Lagomorpha: | 80 |
| Xenarthrans: | 36 |
| Pangolins: | 8 |
| Egg-laying mammals: | 5 |
| Sea cows: | 4 |
| Elephants: | 3 |
Biodiversity
The biodiversity is often evident in the details: It is said that rabbits have brown fur and long ears. This is certainly true for the field rabbit. However, there are many more rabbit species with unique adaptations. For instance, the Arctic hare sports a white coat in winter for camouflage in the snow, while the jackrabbit has particularly large ears to help dissipate heat.
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