Definition
Hydra are small, freshwater invertebrates belonging to the class Hydrozoa. They have a simple tubular body, typically ranging from a few millimeters to a centimeter in length. They possess tentacles covered in stinging cells used to capture prey. Hydra are known for their remarkable regenerative abilities; they can regrow entire body parts. ðŠī They reproduce both sexually and asexually, and are often found attached to submerged vegetation or rocks in ponds and streams.