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A bug in top-selling Wild West computer game Red Dead Redemption has seen players unexpectedly pitted against some strange mutant beasts.

The unintentionally funny problem appears to be caused by a graphics glitch, causing bizarre hybrid human characters and animals to appear in the game, including a disturbing “donkey woman” and flying deers.

The bug has been picked up by YouTube user WhereDaBootz, who has uploaded a string videos of “sightings” of the freakish creatures to the site. (Warning: Videos below contain strong language).

Despite the glitches, the Western epic has been a big hit with games players and critics alike, with the Daily Mirror’s Kevin Lynch awarding the game five stars in his review last week.

A spokesperson for makers Rockstar today confirmed that they were aware of the problem and were working on a patch to fix it.