Hydra vulgaris is a species of small freshwater animals called hydras. They belong to the phylum Cnidaria, which also includes jellyfish and corals. Hydra vulgaris is a tiny, tubular animal that can grow up to 30 millimeters in length. It has a sticky base that attaches to rocks or other underwater surfaces, and a mouth surrounded by tentacles that capture small prey. Hydra vulgaris, a species of small freshwater animals, has been mentioned in research circles related to COVI