Hydra, specifically Hydra vulgaris, are unassuming creatures. At their largest, the freshwater cnidarians (relatives of jellyfish) are just about a centimeter long. Their miniscule bodies are simple, ...

Hydra are infamous for their ability to regenerate tissue after being torn apart. But one mystery about these tiny tentacled creatures that has dogged scientists was: How do Hydra open their mouths?

With lifespans stretching far beyond human comprehension, creatures like the hydra, Greenland shark and Aldabra tortoise don’t experience the urgency of time that fast-living species do. There are ...

Hydra is a genus of tiny freshwater animals that catch and sting prey using a ring of tentacles. But before a hydra can eat, it has to rip its own skin apart just to open its mouth. Scientists ...

THE number of tentacles in Hydra vulgaris Pallas varies from three to nine. The frequency distribution in 869 individuals is From this, though any definite conclusion is risky, it is difficult to see ...

From salamander tails to deer antlers, the innate ability of some animals to regenerate lost body parts has captivated scientists for centuries and driven research into the molecular mechanisms of ...

Researchers identify redundant neural networks in jellyfish-like, freshwater hydra. The work is a step toward modeling how internal states and external stimuli shape the behavior of an organism with a ...

Sleep is one of biology's biggest mysteries. Every species with a nervous system has some form of resting period, and so one theory for why animals sleep is that it helps maintain the brain — allowing ...