Summon spells reference the creature_template entry via columns 110, 11, and 112 (when using zero based). So Feral Spirits column 110 references 28,635. If you look up entry 28,635 in creature_template then you'll notice it's the Feral Spirits entry.
What to do from there should be obvious.
As an aside, eat that high horse you rode in on, schlumpf.