Retelling a story

Then there was this orchard planet which got heavily infested by a species as there were no natural predators for the species. The warden of the planet was keenly interested in diversity, but this was just too much. After consultation with other wardens, he decided not to totally eradicate the species, but to transplant some specimens to another planet. When questioned:"Are you certain the species won't destroy the ecosphere of this place?", his reply was:"Yes, see those Smilodons and other predators? They will keep their numbers down."