Urinary tract
As in other species, rabbit kidneys are retroperitoneal and are situated on either side of the aorta and vena cava. The kidneys have a reddish brown colour, with a smooth surface and a simple structure. The size of the kidneys varies with the size of the rabbit, but they are approximately 3cm long, 2cm wide and 10 cm thick. The ureters can be seen in this image between the hilus of the kidney and the thin walled bladder.