Flying cat and Placental mammal

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

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

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