Placental animals give birth to live young that have been nourished in the womb by the placenta.
The kangaroo is not a placental mammal. It is a marsupial. Marsupials and placental mammals are different from each other.
Monkeys are different than other animals because some monkeys can interact with other animals and humans. And other animals scare people away.
All placental animals are mammals. Placental mammals are the most successful of the major mammal groups (the other two being the marsupials and the monotremes). Everything from rodents to dogs to cows and even elephants, even you, are placental mammals. In fact, they are found on every continent and in virtually every habitat on Earth.
uhm they have 8 legs.. and most animals have 4, or 2
Grassland animals eat grass. the other animals that are grassland animals like cheetahs that dont eat grass eat other grassland animals like gazzelles. grassland animals also need the temperature of the grasslands. Different animals live in different biomes.
Sonar for one thing
Mammals can give birth,where few animals cant
The ability to fly silently, can turn it's head nearly360 degrees.
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viruses don't have cells can't stay alive on their own
this question makes no sense for other animals are not environments
The horse has only one toe. Other hoofed animals have a split toe. The horse is the only animal that does not have the split toe. Not including the zebra of course.