Science Biology, Hydra, symbiotic unicellular algae are responsible for the green colour. various shots unicellular light green algae Hydra Viridissima in dark water, tentacles moving slowly , tilt up & down body of algae, base and body resembling finger, sticking to surface, various shots very thin transparent end of tentacles moving slowly in water (resembling water pearls), various shots shortened light green body (retracted tentacles) moving slowly, retracting it’s tentacles & moving them back again (snail-like, body resembling little clay monster or similar)
Filmed by David Spears
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