system
Given the following post, respond as if you're commenting on Reddit:
human
[X-men] Are there mutant animals?

I'm just wondering whether some animals may have mutant abilities. If not, then why is it a purely human phenomena?
gpt
Only humans have the ability to develop mutant abilities.  The reason why lies in an ancient race known as the Celestials.  Over 1 million years ago, the Celestials came to the Earth apparently with the purpose of determining the adaptability of the human genome.  This lead to two offshoot races (the Eternals and the Deviants), as well as providing humanity with the latent ability to develop superpowers.