Order: Serpentes Snakes Characteristics: 1. No eyelids, but have contact like covers called brilles. 2. No ears, but can feel vibrations through entire body. 3. Fangs that deliver venom. 4. All are carnivores
Snakes Snakes can be found every except Antarctica, Iceland, and New Zealand. Most snakes are terrestrial, but can be tree dwellers, burrows, or live in the sand.
Eye Pupils Snakes pupils can tell you when they are active. 1. A vertical pupil are found in nocturnal snakes.
Eye Pupils 2. A round pupil is found in snakes that are active during the day (Diurnal).
Hunting Snakes kill their prey by 2 methods. 1. Constriction – snake wraps its body around the prey and prevents it from breathing. 2. Venom: 2 main types – Hemotoxins – Neurotoxins
Hunting The venom does 2 things for the snake: 1. Kills the prey, so the snake does not have to chase it. 2. It begins to break down the tissue of the prey.
Hunting Snakes use their tongue to follow chemical scents using the Jacobson’s Organ. Some snakes also have heat-sensitive pits that detect the direction of the prey.
Locomotion 4 ways snakes move: 1. Serpentine Movement: body moves along in a series of curves and pushes off objects on the ground.
Locomotion 2. Concertina Movement: body coils and then grips the ground pulling the rest of the body forward.
Locomotion 3. Sidewinder: snake touches the ground at only 2 points.
Locomotion 4. Caterpillar Crawl: crawl straight forward by belly scales sliding forward catching the ground and pulling the rest of the body forward.
Facts The 2 most venomous snakes are found in Australia. 1. Desert Taipan 2. Dubois’ reef snake 0.7 ounces of their venom is fatal.