VOA慢速英语:Scientists: Monkeys Used Raft to Cross Ocean

monkey - n. type of animal that is closely related to apes and humans and that has a long tail and usually lives in trees

fossil - n.  something (such as a leaf, skeleton, or footprint) that is from a plant or animal which lived in ancient times and that you can see in some rocks

mammal - n. a type of animal that feeds milk to its young and that usually has hair or fur covering most of its skin

raft - n. a flat structure that is used for floating or sailing on water

sloth - n. a type of animal that lives in trees in South and Central America and that moves very slowly

kangaroo - n. an Australian animal that moves by hopping on its powerful rear legs

koala- n. an Australian animal that has thick gray fur, large hairy ears, sharp claws for climbing, and no tail