To be considered a mammal, an animal must produce milk to feed its young, have hair on its body, be a vertebrate and be warm blooded. Animals not falling into these categories are not mammals.Know More
In the world today, there are more than 4,000 species of mammals on land and in the water. The largest known mammal is a blue whale, which can weigh more than 150 tons and grow to be over 100 feet long. The smallest mammal is a hog-nosed bat that weighs half an ounce.
Mammals are different from other animals in that they are vertebrates. This means they have a backbone. Animals lacking a backbone are called invertebrates.
Mammals produce milk to feed their young. The babies feed from glands located somewhere on the mother's body.
Mammals are warm blooded, or endothermic. This means mammals can regulate their own body temperature, and it gives them the ability to adapt to many different types of climate.
Finally, all mammals have hair on their bodies. This can range from the body being fully covered, like that of an orangutan, or having little hair like humans.
Paleontologists and other scientists have discovered proof that mammals have been on Earth since the late Triassic period, some 200 million years ago. During the event at the end of the Cretaceous period that caused the dinosaurs to become extinct, a few small mammals survived and are the ancestors to today's modern mammals, including humans.Learn more about Mammals
A platypus is a mammal. However, it's an unusual mammal in that it lays eggs. This makes it a monotreme as well as a mammal. It's also an aquatic creature that has a bill that resembles a duck's. The males have spurs on their back legs that produce venom.Full Answer >
The mammal with the most teeth is the long-snouted spinner dolphin. This particular species of dolphin has up to 252 teeth, which look like thin, sharp spears.Full Answer >
By size, the world's smallest mammal is the bumblebee bat (Craseonycteris thonglongyai), a species native to Thailand. This species of bat is roughly the size of a bumblebee, with a body and head size of around 1 inch and a typical weight of about 0.7 ounces.Full Answer >
Mammal life cycles vary based on the species, but mammalian life cycles share the same fundamental infancy, adolescent and adult stages. Mammals begin as an egg cell fertilized by a sperm cell. Mammalian young are born after an incubation period in a womb.Full Answer >