According to Damian Tryp, Homo Killcrop is a genetic predecessor to Homo superior. Also known as Changelings, Killcrops or Replacement People, this category of mutants possesses an X-Gene which manifests at birth instead of during adolescence. The evolutionary trait of delaying the onset of mutant powers helped more members of the species survive and proliferate.
Eventually, the "change", the mutation was "buried until adolescence", ensuring the survival of the mutants, and leading to Homo superior.
Changelings are still considered by most to be merely a subset of mutants, since several mutants in the modern era have manifested either all or part of their abilities at birth, but Damian Tryp presented changelings as a separate species. Seeing as how his motives were to convince Jamie Madrox's parents of his own personal ability to take care of their son as opposed to Professor X, he may have been disingenuous as to how large the differences between changelings and mutants are.
Powers and Abilities
Average Strength level
Gravity: 9.80665 m/s²
Atmosphere: Roughly 78.09% Nitrogen, 20.95% Oxygen, 0.93% Argon, 0.038% Carbon Dioxide, and small amounts of other gases.
Population: Two (Madrox and Damian Tryp).
Mutants activated at birth or Homo Killcrops
Many mutants have used their powers before their puberty, without a clear statement and the use of one of the terms for that (sub)species.
Tryp sort of stated that mutants didn't reveal themselves at birth, and opposed to the idea of exceptions, making all the early activated mutants changelings in his perspective.
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