Name: Mrs P.
Date: July 2004
How do reptiles concentrate their urine?
Reptiles have a different kind of kidney structure than do mammals and
they are not able to concentrate their urine. They make up for this by
excreting their nitrogen wastes as uric acid (which can be highly
concentrated and paste-like) rather than as urea. Reptiles do absorb
some water back from the urine in the cloaca, but they can not respond
to dehydration by concentrating urine in the kidney as mammals do. They
excrete other excess salt ions through their salt glands.
Laura Hungerford, DVM, MPH, PhD
University of Maryland
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Update: June 2012