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AmphibiansClass Amphibia
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AMPHIBIANS• Amphibians begin life in water.• They start out as tadpoles and breathe
with gills• As they grow, they develop lungs and legs• They move to land as adults• Amphibians move back to water to lay
eggs.
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Amphibians
LIVE ON LAND BUT STAY NEAR THE WATER
Chinese Giant Salamander
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Adaptations
• Mobile, muscular tongue allows amphibians to capture and manipulate food.
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Adaptations
• Breathe through the skin or with the use of gills or lungs
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Amphibians return to the water to lay eggs.
• Eggs do not have shells
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Strategies to keep eggs wet:• Laying eggs directly in water• Laying eggs on moist ground• Wrapping eggs in leaves
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Pygmy Marsupial FrogFlectonotus pygmaeus
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Tadpoles
• Some frogs start as tadpoles• Have gills and a broad-finned tail
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Tadpole into Adult Frog
• Gills are reabsorbed and lungs develop• Circulatory system is reorganized to send
blood to the lungs• Tail fin is reabsorbed
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Tadpole into Adult Frog
• Body grows limbs and completely reorganizes its skeleton, muscles, and parts of the nervous system.
• Digestive system is rebuilt to handle a carnivorous diet.
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Amphibians
• Salamanders
• Frogs
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Salamanders
• More than 300 species
• Long body• Four walking limbs• tail
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Frogs
• Over 3000 species• Largest group of living amphibians
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Adult Frogs
• Tailless bodies• Long, muscular hind limbs• Webbed feet• Exposed eardrums• Bulging eyes
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Adult Frogs
• Bodies adapted for jumping– Elongated bones in their hips, legs and feet
for increased speed and power– Hind legs have fused bones that absorb the
shock of landing
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Toads
• One family of frogs• Rougher, bumpier
skin• Shorter legs- not
good jumpers• Glands make toxins
that protect them from predators – also in tropical frogs
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Frogs
• Live in every environment on Earth except at the poles and the driest deserts.