@Kchoo
You may want to read this (entire chapter).
The Resurrection of Sri Yukteswar - Chapter 43 of Autobiography of a Yogi by Paramhansa Yogananda
“The ordinary astral universe-not the subtler astral heaven of Hiranyaloka-is peopled with millions of astral beings who have come, more or less recently, from the earth, and also with myriads of fairies, mermaids, fishes, animals, goblins, gnomes, demigods and spirits, all residing on different astral planets in accordance with karmic qualifications. Various spheric mansions or vibratory regions are provided for good and evil spirits. Good ones can travel freely, but the evil spirits are confined to limited zones. In the same way that human beings live on the surface of the earth, worms inside the soil, fish in water, and birds in air, so astral beings of different grades are assigned to suitable vibratory quarters.