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Additional resources for Animal Life: Secrets of the Animal World Revealed
Arachnids are mostly predatory, although a few are scavengers and some mites are parasitic. They have narrow mouths and cannot eat large pieces of food, so they rely on enzymes to predigest their prey outside the body or in a preoral cavity. 5–12 cm) Pseudoscorpion Dactylochelifer sp. ⁄16 – 3⁄16 in (2–4 mm) 1 Soft tick Argas persicus 1⁄4 in (6 mm) Vinegaroon Thelyphonus sp. 5 cm) Whip-spider Phyrnus sp. 5 cm) 3 Funnel-web spider Atrax robustus 3 ⁄4 –11⁄2 in (2–4 cm) Red-kneed tarantula Brachypelma smithi 4 in (10 cm) Jumping spider Salticus sp.
Most importantly, the larval gills are lost and replaced by air-breathing lungs. In frogs and toads, the tail is reabsorbed during metamorphosis and the limbs develop. Skin The skin of amphibians contains glands, is commonly moist, and lacks scales, feathers, or hair. Most amphibians have lungs but all, to a greater or lesser extent, take in oxygen through their skin. The skin is also important for taking in water from the environment and contains numerous pigment cells that give it color. Many amphibians are brightly colored; this is especially common in poisonous species, in which striking colors and skin patterns serve as a warning.
1 m) long, common in the arid American Southwest. It is active mainly at night. 8 m) Bibron’s burrowing asp Atractaspis bibroni 20–28 in (50–70 cm) Cuban woodsnake Tropidophis melanurus 31 in–39in (80–100 cm) Eastern coral snake Micrurus fulvius 28–39 in (70–100 cm) Crocodiles, alligators, and gharials Order Crocodilia Crocodilians are one of the two surviving groups from an evolutionary line that also contained the extinct dinosaurs, the other survivors being the birds. Crocodilians are covered with thick bony plates and are semiaquatic predators.