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While not terribly fast swimmers, their deceptively flexible and slippery bodies allow them to squeeze into considerably tight places if it's necessary; however, they are slow and clumsy on land. The whiskers on their snouts are highly sensitive and capable of detecting minute vibrations in the water, and are even capable of electroreception, which makes up for their rather poor eyesight and hearing. They have quite a good sense of smell, though.
As mentioned earlier, the poisonous mucus and skin of the Umikuji protects it from a great deal of predators who might try to eat it. However, they are generally safe to touch, so long as ones hands are washed afterwards; the Umikuji's poison is only dangerous if ingested, or if it gets into any open wound or sore.
Umikuji have the natural ability to manipulate the Element of Water. They can shoot streams of water at considerable velocities, partially inflating their bodies and using the contraction of their muscles to force the water out. They are typically seen using energy-based techniques of the Water Element, such as Water Pulse and Bubblebeam.
In some parts of Mobius, the meat of the Umikuji is actually considered a high-priced delicacy; when prepared properly, it is safe to eat, much like how ''fugu'' (the dish prepared from pufferfish) is edible when prepared properly. Also like fugu, Umikuji meat requires specialized chefs to prepare it, and they are required to undergo two to three years worth of extensive training in order to obtain a licence for this. A single, tiny mistake in the preparation process can have disastrous consequences.