Snarfing the snarf....
Vulnerable to Snarfing (Ex): The best way to destroy a gello monster is to eat it. Bite attacks deal normal damage to a gello monster, and do not cause it to split. Creatures without bite attacks may attempt to bite a gello monster. Treat this attack as if the creature had a natural bite attack. Damage is based on the creature's size: Fine = 1, Diminutive = 1d2, Tiny = 1d3, Small = 1d4, Medium = 1d6, Large = 1d8, Huge = 2d6, Gargantuan = 2d8, Colossal = 4d6.
A creature must swallow the bitten off bit or risk facing another smaller gello monster. Each bite that deals 3 or more points of damage that is not swallowed becomes an independent gello monsters (as per the creature's split ability). Smaller chunks simply perish.
Gello monster bits are very filling. A creature snarfing a gello monster must succeed on a Fortitude save after each bite (DC 10 + 1 per bite) to continue snarfing. A creature that fails its save and attempts to continue snarfing is sickened for x rounds.
A creature with the swallow whole special attack that successfully swallows a gello monster kills it instantly.