Even though genetic evidence has shown that every species of oo is descended from a common ancestor, they have nevertheless evolved extremely distinct behaviors. The sitting oo never stands or even moves once it reaches adulthood, relying on nutrients in the soil and a sort of photosynthesis for nutrition, and its motile young to spread the species out. Needless to say, the sitting oo was decimated by the introduction of toothed grumbles and exists mainly in preserves today. The standing oo moves as an adult if it must, but prefers to stay standing in one place. In addition to soil and sun, it can also eat grasses and some small animals, and it will usually consume everything within its reach before it moves on, though it will move early if threatened. The toothed grumbles have been less successful in reducing the number of standing ops, though they are still much rarer than they once were. The running oo and the flying oo, which both start moving shortly after birth and never stop until they die of exhaustion, are both extinct in the wild thanks to toothed grumbles. The most common species, the walking oo, is still quite common though.

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