Mammals rely on a sense of smell to find food and warn them of their enemies. Many species use smell to communicate with each other. Humans, apes and monkeys have a relatively bad sense of smell. Taste helps mammals identify the food that they eat.
Most mammals have a good sense of hearing. Some mammals use their hearing to detect objects in the dark. Bats, for example, use sounds to navigate and detect tiny insects. Dolphins also use such a system to find their way around.
Bats use sounds to fly around
Mammals have a good sense of touch. They have nerves in all parts of their body that let them feel things. Cats and mice have whiskers with which that they can feel themselves around in the dark.
The whiskers of a cat help them feel things