CK12 Life Science

Figure 13.18: A species of toad, showing typical characteristics of leathery and warty skin, and brown coloration. ( 9 ) Cameroo ...

their prey whole. Roles of Amphibians Frogs are raised commercially as a food source (frog legs are a delicacy in China, France, ...

Lesson Summary Amphibians have adaptations for both aquatic, including gills, and terrestrial, includ- ing lungs and moist skin ...

Vocabulary convergent adaptation The appearance of similar traits in groups of animals that are evolutionarily unrelated to each ...

Check Your Understanding What are some adaptations for living on land that are present in the amphibians? What features present ...

Figure 13.20: A tuatara. ( 19 ) Many of the viviparous species feed their fetuses through various forms of placenta, similar to ...

The reptilian brain is similar to that of amphibians, except the cerebrum and cerebellum are slightly larger. Most typical sense ...

Figure 13.22: A Komodo dragon, the largest of the lizards, attaining a length of 10 ft. ( 28 ) and others have reached sizes whe ...

Figure 13.23: A species of lizard, showing general body form and camouflage against back- ground. ( 8 ) Figure 13.24: A species ...

Because snakes cannot bite or tear their food to pieces, prey must be swallowed whole. The body size of a snake has a major infl ...

Figure 13.26: A northern water snake shedding its skin. ( 2 ) Alligators and Crocodiles Crocodilia, containing both alligators a ...

Figure 13.27: Two Nile crocodiles, showing the basic crocodilian body plan. ( 11 ) are known to swallow stones, known as gastrol ...

The upper and lower jaws are covered with sensory pits, which encase bundles of nerve fibers that respond to the slightest distu ...

Figure 13.29: A Galapagos giant tortoise, pictured here, can grow to over 4 ft in length and weigh about 670 lb. ( 18 ) Most tur ...

sensitivities ranging from the near ultraviolet to red. (For a description of rods and cones, see chapter titledControlling the ...

tortoises. Snakes or serpents (the latter usually referring to a mythic or symbolic snake) are associated with healing in the Bi ...

Figure 13.31: The Rod of Asclepius, where the snake is a symbol of healing and medicine. ( 31 ) ...

Pit vipers, pythons and some boas have infrared-sensitive receptors in deep grooves between the nostril and eye. What role migh ...

Points to Consider Some lizards have a dewlap, a brightly colored patch of skin on the throat, which is used in displays. What ...

(12) Mat Honan. http://commons.wikimedia.org/wiki/File:Pacific_Giant_Salamander.jpg. CC-BY 2.0. (13) http://commons.wikimedia.or ...