Caption:
Sidewinder Rattlesnake (Crotalus cerastes cercobombus). Early in the spring the Sidewinder may be active during the day, but as soon as the weather warms up, it becomes nocturnal. It's strictly a desert creature, specially adapted for life in wind-blown sand. Sidewinding is an adaptation for moving over soft sand. When sidewinding the snake applies vertical pressure to the ground which minimizes slippage and leaves a distinctive parallel series of 'J' shaped tracks. The hooks of the 'J' marks point in the direction of travel.