Lemurs are part of the primate family, which is the same group as monkeys, apes and you. But unlike monkeys, lemurs only live in one country. Every single wild lemur on the planet lives in Madagascar.
Lemurs come in lots of shapes and sizes. The smallest, the mouse lemur, is about the size of a satsuma and fits in the palm of a hand. The biggest, the indri, is roughly the size of a four-year-old child and sings to its family across the forest.
Most lemurs live in the trees. They use their long tails for balance as they leap from branch to branch - sometimes jumping more than 10 metres in one bound. Their big round eyes help them see in the dark, because many lemurs are awake at night.
Lemurs ended up in Madagascar because the island broke off from the rest of Africa about 88 million years ago. The lemurs' ancestors floated across on rafts of plants, then evolved on their own for tens of millions of years - which is why there is no other place in the world where they live wild.