Early in the morning, blue-tongues emerge to bask in sunny areas before foraging for food during the warmer parts of the day. Like all lizards, blue-tongues do not produce their own body heat, and rely on the warmth of their surroundings to raise their body temperature. When threatened, blue-tongues turn toward the threat, open their mouth wide, and stick out their broad, blue tongue. This contrasting display, together with the large size of the head, may frighten off predators. Blue-tongues may also hiss and flatten out the body, making themselves look bigger. A frightened blue-tongue may bite if it is picked up. If handled roughly by their tail, blue-tongues will drop it. Their stump heals quickly and will regenerate with some time, though it will be shorter.