Simplify the following text for a Grade 5 native English-speaking person.
Original: The smaller , nocturnal lemurs , such as mouse lemurs , giant mouse lemurs , and dwarf lemurs , usually give birth to more than one infant , whereas the larger , nocturnal lemurs , such as fork-marked lemurs , sportive lemurs , and the aye-aye usually have one offspring .
Simplified: There are two so-called flying lemurs , but they are not real lemurs .