Sorry for the lessons in your thread bgonz, but it needs to be said lol. I guess the best way to show it is with pics. This is not a rtc but you'll get the idea just the same. This is my 14" lima. His/her mouth looks really small, but looks are decieving. Look at how big the mouth can open. Just triple that for a rtc the same lenth. Should give you some idea. Most catfish' mouths can open in this fashion to consume large prey whole. They can usually open their mouths to about 75% of their own body thickness. hence the size fish that can fit in there.