With three little words, and entire race was nearly obliterated. Every mutant who dies is one number closer to zero. Endangered Species, a series of 8-page back-ups in the four core X-titles, follows the Beast as he races against the clock to save this once-thriving race. Collects the X-Men: Endangered Species One-Shot, and #1-17 back-up stories

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Vicious Circle (Felix Castor)
Dead Men's Boots (Felix Castor)
The Devil You Know (Felix Castor)
Vicious Circle (Felix Castor)
Ultimate Fantastic Four Vol. 4: Inhuman (v. 4)