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==Gastrointestinal Tract==
 
==Gastrointestinal Tract==
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The organs and divisions of the gastrointestinal tract are similar to those of mammals. The lizard has a simple, elongated stomach. The liver may contain melanin and have black spots - all lizards have a gall bladder. A caecum is present in many species and herbivorous lizards have a sacculated colon to aid fermentation.
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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.
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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.
    
==Cloaca==
 
==Cloaca==
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A cloaca is present and is divided into coprodeum (collects faeces), ureodeum (collects urinary wastage) and proctodeum (final chamber prior to elimination)
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A cloaca is present (with a transverse cloacal slit) and is divided into three parts:
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* coprodeum (collects faeces)
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* ureodeum (collects urinary wastage)
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* proctodeum (final chamber prior to elimination)
     
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