Colugo and Placental

Colugo 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 and colugo are semantically related. In some cases you can use "Placental" instead a noun "Colugo".

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

Colugo and placental are semantically related. Sometimes you can replace term "Colugo" with "Placental", this nouns are similar.