Lizards change their posture to soak up warmth from the sun during cool mornings.

The longer version

Reptiles generate little internal heat, so body temperature depends on the environment. Basking is thermoregulation by behaviour: adjusting posture, angle and location to control how much solar radiation and warmth from the ground the body takes in.

A lizard flattens its flank toward the sun to increase the surface presented to it, darkens slightly to absorb more, and presses its belly against a warm rock to pick up conducted heat. When it overheats, the posture changes: the body lifts, turns away, or retreats into shade. Because digestion, muscle power and reaction speed all depend on temperature, this careful balancing act determines how well the animal can hunt, escape and process a meal.

Where this entry sits

This collection gathers small surprises about mammals, reptiles, amphibians, birds, fish, insects, and the pets living alongside people. Expect odd details about senses, anatomy, and everyday behaviour that many people never notice in the animals around them. The full list sits on the Animals page, where every entry is listed in order.