Different species of hydra are found all over the world. Lives in freshwater bodies such as ponds, ponds, canals, bilges, lakes, springs etc. They are not found in turbid, high and moving water. They hang downwards on a submerged solid object or plant leaf. Hydra vulgaris (orange-red), Hydra oligactis and Hydra viridissima (green) are found in freshwater bodies of Asia, Europe and America, including Bangladesh.