Gape of the Serpent
( Savage Species, p. 35)[General]
You can swallow larger creatures than normal.
Prerequisite
Swallow whole,
Benefit
You can swallow a creature of up to your own size category. Like a snake, you can stretch your mouth to an outlandish extent to accommodate immense prey. However, this process is time-consuming. If your second grapple check is successful after you have established a hold against a creature larger than you could swallow normally, you begin to swallow the held creature. On the following round, you must make an additional grapple check to complete the swallowing. The held creature can fight or try to break the grapple as normal while you are attempting to swallow it.
Special
Your gullet can hold one creature of the maximum size; other maximum numbers of swallowed creatures
remain the same.
Normal
Unless otherwise noted, a creature can swallow opponents no larger than two size categories smaller than itself.