Adult gerbils weigh 2 to 3 ounces (50 to 90 grams). Males are slightly larger than females. The coats of gerbils in the wild are “agouti” colored, or a mix of gray, yellow, and black, with an off-white belly. Breeding has produced gerbils with many different coat colors, including black, buff, white, gray, and spotted. They are about the size of mice, with their bodies measuring about 4 inches (10 centimeters); their fur-covered tails can add an additional 3 inches (8 centimeters). Gerbils typically live for 2 to 3 years.
Both male and female gerbils have a ventral marking gland on their abdomen. The gland appears as an orange-tan hairless area that is usually oval in shape. It can sometimes be mistaken for a tumor. In male gerbils, the gland enlarges during puberty and produces an oily secretion. Male gerbils may use this as a way of “marking” territory, and they can sometimes be seen rubbing their abdomen on objects.
Last full review/revision July 2011 by Katherine E. Quesenberry, DVM, MPH, DABVP (Avian); Kenneth R. Boschert, DVM, DACLAM