Mutations

Mutations are living organisms found on Earth by the delinquents that have been modified or disfigured by nuclear radiation.

Two Headed Deer
The Two-Headed Deer is seen in Pilot. It is the result from mutation after a century of radiation, which caused it to have two heads. It is not hostile, and it is unknown if it uses both heads. It is seen in Pilot and in the title sequence of every episode thus far. From the side view, the deer looks like any other regular deer would have prior to the apocalypse. The body is the same in every way to a non-mutated deer; the only difference is the heads. One head is the primary head with most of the features, the other one is the secondary head because it is relatively smaller and shares less parts. The primary head has both antlers, one ear, a snout, one regular eye and barely any pink spots. The secondary head has no antlers, one ear, a deformed snout, one eye and many pink spots. Both heads share an eye in the middle.

Luminous Butterflies
The Luminous Butterflies are seen in the episode Earth Skills. They look like ordinary butterflies, other than the fact that they seem to glow in the dark. The butterflies so far have only been seen during the day and do not appear hostile, rather acting like normal butterflies, other than the fact that they seem to travel in swarms.

River Snake
First shown in the episode Pilot, the River Snake lurks in rivers and attacks whatever comes in with it. It is estimated to be 10 feet long and 2 feet wide. It slithers like a snake, but it also swims and bites like a piranha. It can cause minor injuries or fatal ones, depending on how quick their victim is to escape.

Luminous plants
Like the butterflies, some plants on Earth glow in the dark. The plants that glow are mainly mossy tree bark and bushes. While they glow at night in the first episode, they don't appear to glow in later episodes, indicating a possible inconsistency, or a cycle, meaning that they only glow some nights.

Hallucinogenic Nuts
Featured in the promo, Day Trip, hallucinogenic nuts cause members of the 100 to experience hallucinations and/or paranoia. While these nuts have not been established as a mutation, as of current day, no hallucinogenic nuts grow naturally in the area of the US where the 100 is settled, indicating either a mutation or a migration of natural plant species, both of which could be caused by nuclear radiation.