If the citizen initiated proposition had passed, it would have make it illegal to hunt and kill bobcats, mountain lions, and lynx in Colorado.

Petitions were circulated by the group Cats Aren't Trophys and largely funded by animal rights organizations.

[2] The proposition appeared on the ballot as follows:[3] Shall there be a change to the Colorado Revised Statutes concerning a prohibition on the hunting of mountain lions, lynx, and bobcats, and, in connection therewith, prohibiting the intentional killing, wounding, pursuing, entrapping, or discharging or releasing of a deadly weapon at a mountain lion, lynx, or bobcat; creating eight exceptions to this prohibition including for the protection of human life, property, and livestock; establishing a violation of this prohibition as a class 1 misdemeanor; and increasing fines and limiting wildlife license privileges for persons convicted of this crime?The main campaign in favor of Proposition 127 was led by the group Cats Aren't Trophies.

Colorado's official voter guide offered the arguments that hunting big cats is inhumane and supports the unnecessary practice of commercial fur trade.

[5] The state's official voter guide also offered the arguments that Proposition 127 would have restricted Colorado Parks and Wildlife's ability to manage big cat populations, lynx hunting is already illegal in Colorado, and hunting mountain lions and bobcats provides an important revenue source to wildlife management systems and local communities.