# Green hydra (Hydra viridissima) under darkfield microscopy

Green hydra (Hydra viridissima) under a microscope, filmed with a 4x objective in darkfield illumination. The specimen was collected from an old quarry near Rakvere, Estonia. The video shows the body column and the tentacles surrounding the mouth, which the animal moves slowly. The green colour of the hydra comes from symbiotic algae living in its cells.

- Kind: Short
- Year: 2020
- Runtime: 2 min
- By: Janeklass
- Genres: Nature
- Archive: [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Green_hydra_(Hydra_viridissima)_under_darkfield_microscopy.webm)
- Licence or status: [CC BY 4.0](https://creativecommons.org/licenses/by/4.0) (as the archive states it)
- Credit: Janeklass
- Who can watch: Tweens profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

[Watch now](https://invisiblenetwork.ai/watch/archive/commons/202214924?play=1)