Paras is an insectoid creature resembling the nymph stage of a cicada, with the unique feature of having mushrooms known as tochukaso growing from its back. They grow from spores that are doused on this Pokémon's back at birth by the mushroom on its parent's back. The tochukaso can be removed at any time, although researchers suggest that Paras only do so under extreme measures.
Though tochukaso are parasitic in nature, Paras manages to make use of the mushrooms by creating a semi-symbiotic relationship; the mushrooms draw their nutrients from the host Paras's body in order to grow, and Paras is able to use the mushrooms spores along with its own pincers for self-defense.
Paras may have long life spans, because the tochukaso is known for having properties that are beneficial for longevity.
The mushrooms on Paras's back are often prized by collectors.
The mushrooms on its back have a very commanding influence over Paras and order it to extract juice from tree trunks. It is also very timid.
Paras can often be found in caves, since sunlight and dry air hurt their skin. They can also thrive in damp forests with high amounts of humidity where conditions are ideal for fungi. It is most commonly found in Kanto and Johto.
It is unknown if Paras eats regular food in the wild or if it gets all of its nutrients from the roots that it sucks, though most of the food is absorbed by the mushrooms on its back. However, they have been known to prey on Weedle.
This Pokémon was unavailable prior to Generation I.