Abstract
Though it is well known that polar bears have lobated kidneys, actual images of it have not been published. This is an anatomical record of the right and left kidneys of a male polar bear, died of gastric and duodenal torsion at a zoo in May 1998. The estimated age was 20 years old and body weight was 300 to 350 kg. The size of left kidney was 19cm × 9cm × 4cm and right one was 17cm × 9cm × 5cm. The weight of left kidney was about 480g and that of the right one was 486g. The number of renculi(lobes)on the surface was 57 in left and 54 in right kidney. Not a few lobes contained two renculi and some had three renculi, giving a total of renculi approximatery 140-160.
