Changes

The organs and divisions of the gastrointestinal tract are similar to those of mammals. The lizard has a simple, J-shaped, elongated stomach. A caecum is present in many species. The large intestine is thin-walled and less muscular than the stomach or small intestines.

The organs and divisions of the gastrointestinal tract are similar to those of mammals. The lizard has a simple, J-shaped, elongated stomach. A caecum is present in many species. The large intestine is thin-walled and less muscular than the stomach or small intestines.

Herbivorous lizards such as the green iguana, prehensile-tailed skink, egyptian spiny-tailed lizard and chuckwalla (''Sauromalus obesus'') have a sacculated colon to facilitate hindgut fermentation. These animals usually have higher optimal body temperature zones in order to enhance microbial fermentation.

Herbivorous lizards such as the [[Green Iguana|green iguana]], [[Prehensile-tailed Skink|prehensile-tailed skink]], [[Spiny-tailed Lizard|egyptian spiny-tailed lizard]] and [[Chuckwalla|chuckwalla]] (''Sauromalus obesus'') have a sacculated colon to facilitate hindgut fermentation. These animals usually have higher optimal body temperature zones in order to enhance microbial fermentation.

==Cloaca==

==Cloaca==