Examples of hydra

This example is from Wikipedia and may be reused under a CC BY-SA license.
The hydra's nervous system is like a telephone exchange whereby whatever number you dial you are eventually connected to all other subscribers.
In fact, nothing stood in the way of the benevolence hydra's achievement of absolute mastery over the nation and its inhabitants.
Both sets of genes may have an interest in the survival of hydra bodies.
Private lines of this sort, and therefore real nervous systems, appear in rather more complex organisms than hydra, the planaria, or flatworms.
Inside a man's head, there is a sea, and in that sea there lives a hydra.
A revealing spectrum can still be found today among species of hydra- small, sedentary, tentacled animals, like freshwater sea anemones.
The small freshwater hydroid, hydra, has a glove-like form, its tentacles being used to capture prey.
Muscle-like cells are found in all animals, including primitive ones like hydra.
Another task was to keep the topic of 'writing' from overwhelming me with its hydra-like propensity to grow new heads of discussion with every encounter.
If five peaks were set up they could provide the basis for the tentacles of hydra, or for the fingers in the early development of the human hand.
What is more, whereas in hydra the proto-nerve cells are more or less evenly distributed throughout the animal's body, in planaria the distribution of cells is not symmetrical.
Hydras use this kind of reproduction more often because it is easier and will create more hydras than other methods.
From
Wikipedia