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By Sarah Kahanic Grade: 6-8 Subject: Life Science

Amphibians!. By Sarah Kahanic Grade: 6-8 Subject: Life Science. What is an Amphibian?. Lay Eggs in Water Eggs don’t have shells Born with gills Cold-blooded Moist Skin Develop lungs and legs Live on land at maturity. Life Cycle of an Amphibian.

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By Sarah Kahanic Grade: 6-8 Subject: Life Science

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  1. Amphibians! By Sarah Kahanic Grade: 6-8 Subject: Life Science

  2. What is an Amphibian? • Lay Eggs in Water • Eggs don’t have shells • Born with gills • Cold-blooded • Moist Skin • Develop lungs andlegs • Live on land at maturity

  3. Life Cycle of an Amphibian All amphibians start life as an egg in a ball of jelly. The eggs are laid in water. The egg hatches and the young amphibian breaks out of the jelly. We call the young of a frog or toad a tadpole. The young amphibian has gills to breathe underwater and a tail with a fin so it can swim. When it gets bigger it starts to grow legs. When it is full grown it changes quickly to its adult body shape. It loses its gills and grows lungs to breathe air. It loses its tail fin and its legs grow much larger. Then it leaves the water to live on land. It looks like an adult now, only much smaller.It takes a couple of years for an amphibian to grow to its adult size. In spring the adult will return to the pond, lake or stream where it was born to look for a mate. Then the females lay eggs to start the cycle over again. (Nature North)

  4. Life Cycle of a Typical Amphibian

  5. Life Cycle Video

  6. Fours DifferentTypes of Amphibians • Frogs • Toads • Salamanders • Newts

  7. Newts and Salamanders • Newts and Salamanders are both belong to the group “Urodela” which are amphibians with four legs and a tail at maturity. These amphibians resemble lizards • Newts are a subset of the Salamander species • All newts are salamanders,but not all salamandersare newts

  8. Differences between Newts and Salamanders Salamanders Newts • Nocturnal • Spends most of life in or by water • Poisonous • Brightly Colored • Active during the day • More complex life cycle (spends days away from water)

  9. What is the name for the group of amphibians the Newt belongs to? • Urodela • Anura • Anapsid • Parareptilia

  10. Incorrect Please select the button and reread the section on Newts before continuing

  11. Correct!

  12. Frogs and Toads • Both Frogs and Toads belong to the group “Anura” that lacks tails and have long hind legs well-adapted for jumping and swimming

  13. Differences Between Frogs and Toads Frog Toads • two bulging eyes • strong, long, webbed hind feet that are adapted for leaping and swimming • smooth or slimy skin (generally, frogs tend to like moister environments) • Frogs tend to lay eggs in clusters. • stubby bodies with short hind legs (for walking instead of hopping) • warty and dry skin (usually preferring dryer climates) • paratoid (or poison) glands behind the eyes • The chest cartilage of toads is different also. • Toads tend to lay eggs in long chains.

  14. Select which picture is the toad

  15. Incorrect Please select the button and reread the differences between toads and frogs before continuing

  16. Correct! Congratulations! You have finished this mini lesson.

  17. Bio Page • This mini lesson was created by Sarah Kahanic for EDU 103 • For more informationEmail: srhkhnc@dordt.edu

  18. References and Resources • Life Science by Mc DougalLittell (2006) • http://www.scienceclarified.com/Al-As/Amphibians.html • http://allaboutfrogs.org/weird/general/frogtoad.html • http://www.flickr.com/groups/salamanders/discuss/72157594451142303/ • http://www.naturenorth.com/1np/Species/amphibian/Lifcyc/Flfcyc.html

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