The food is then directed into its mouth. The tentacles are often sticky. There are enough of these tentacles that animals can even be entangled in them without being stung. The opening that acts like a mouth is very elastic. The body of the hydra is also very elastic.
Many hydra can capture and eat animals larger than themselves because their bodies are very elastic.
Hydras can move about in two ways. A hydra inches along rocks or twigs with wave-like movements of the bottom of the single foot. It can also somersault end over end along the surface of twigs or rocks. Hydras produce more hydras by budding. In budding, small hydras, complete with tentacles, grow on the side of the larger hydra.