The belly of the blue-tongue is usually quite pale with darker variegations adorning their back. Their eyes are small and reddish-brown to grey. The tongue is dark blue and the lining of the mouth is bright pink. Blue-tongues have a long body, large head and short legs and toes. The tail is shorter than the body and generally tapers evenly to a point. Male blue-tongues may have a proportionally larger head than femalesBlue-tongues live alone for most of the year, but between September and November males pursue females and mating occurs. At this time, males may fight aggressively among themselves. Mating may be rough, with females carrying scrape marks from the male’s teeth. Female blue-tongues give birth to live young three to five months after mating, between December and April. The young are independent at birth, and disperse within a few days. Of all the blue-tongues, the eastern blue-tongue has the largest litters and the smallest young. Up to 25 (but usually about 10) young are born, each measuring 130-140 mm in total length and weighing 10-20g. Blue-tongues are long-lived and several captive animals have lived for 20 years.