Flying lemur and Placental mammal

Flying lemur noun - Arboreal nocturnal mammal of southeast Asia and the Philippines resembling a lemur and having a fold of skin on each side from neck to tail that is used for long gliding leaps.

Placental mammal and flying lemur are semantically related. In some cases you can use "Placental mammal" instead a noun phrase "Flying lemur".

Placental mammal noun - Mammals having a placenta; all mammals except monotremes and marsupials.

Flying lemur and placental mammal are semantically related. Sometimes you can replace phrase "Flying lemur" with "Placental mammal", this phrases are similar.