- Are in the class Mammalia within the subphylum Vertebrata.
- Are warm-blooded. They have the ability to maintain their body temperature by internal means. The technical word for this is endothermy. Birds are the only other group of animals in the world that can do this.
- Feed their babies milk.
- Have hair. This unique body covering is made of keratin and grows from special cells located in the skin. Some mammals are hairier than others. Marine mammals such as whales may be virtually hairless.
- Have a four-chambered heart. This is the most advanced kind of heart. It keeps the arterial (oxygenated) and venous (oxygen-depleted) blood completely separate.
- Have live birth. The monotremes (platypus and echidnas) are exceptions in that they lay eggs. In marsupials, such as the opossum, the young are born in a very primitive state and then finish their development in an external pouch.
- Have very specialized and diversified teeth. Again, there are some exceptions (monotremes, baleen whales, e.g.), but the mammals have carried the development of teeth farther than any other group of animals.
- Have a diaphragm. The diaphragm is the special muscle located below the lungs that draws air into the lungs. This increases the efficiency of breathing. No other type of animal has this muscle.
Rodents: Order Rodentia
A rodent has gnawing teeth and can live in many habitats. This is our largest group of mammals, and there's far more than mice in this bunch.
American Beaver: they can weigh up to 110 lbs.
Ord's Kangaroo Rat: their desert adaptations are intense. They even produce their own water through their metabolism.
Northern Grasshopper Mouse: this mouse is 90% carnivorous and howls like a tiny wolf.
Black-tailed Prairie Dog: their barks contain coded information, which makes their chattering a language. They even have regional dialects.
DID YOU KNOW?
Black-tailed prairie dogs, named for their black-tipped tails and dog-like "bark," once lived throughout the Great Plains in "towns" that extended for miles and contained hundreds of thousands of individuals.
Bats: Order Chiroptera
Bats, our second-largest group of mammals, are the only true flying vertebrates alive today besides birds. Myths and misconceptions stoke our fear of bats, but they're an important part of the ecosystem.
Only a small percentage of bats carry rabies, but they can carry it. Never handle wildlife, including bats, and avoid direct contact with them. Consult with medical professionals if someone you know may have been exposed to a bat.
Their free pest control services are worth up to $53 billion each year.
Bats eat up to two-thirds their body weight in insects each night, removing thousands of insects from agricultural areas and human residences.
This deadly invasive bat disease is a fungus that attacks hibernating bats. It was introduced from Europe, so American bats have not developed defenses against it. It was officially documented in Kansas in 2018 and is still spreading across the United States.
DID YOU KNOW?
Bat's aren't blind.
They see as well as any other mammal, even without their sonar.
Armadillo: Order Cingulata
There are 21 species of armadillo in the world, including the Giant Armadillo that can get up to 71 lbs. The smallest armadillo is called the pink fairy armadillo, it only gets up to 6in in length. They also have really fun names, like the screaming hairy armadillo. The only species that lives in Kansas is the nine-banded armadillo.
Armadillos have a natural armor. In fact, its name in Spanish means “little armored one.” That armor is great for protection against predators like coyotes, foxes, and bobcats, but it does little to help them against their number one killer: vehicles. Which is how they got the unfortunate nickname the “Hillbilly Speed Bump,” for their uncanny ability to get hit by cars.
It’s true that an armadillo can curl up into a ball, but not all armadillos can. In fact, only one species, the three-banded armadillo, can roll itself up like that. Other species will quickly dig a hole and hunker down so their unarmored, vulnerable stomach is protected.
DID YOU KNOW?
Armadillos are close cousins with anteaters so they share similar characteristics, like pointy snouts, long, sticky tongues, poor eyesight and a highly developed sense of smell.