Life Cycle of a Frog

1. Life Cycle of a Frog

2. Life begins in water as eggs. Each egg has three jelly coats which enlarge with water to support it. The eggs are gathered together in a clump called a spawn . Egg

3. Between 6-10 days, the egg hatches and a tadpole wriggles out of the jelly ball. The tadpole has external gills which they breathe through. Tadpole With gills

4. The tadpole begins feeding on algae and a skin fold grows over the external gill leaving a spirade for water to exit. Tadpole

5. Gradually the hind legs appear, followed by the forelimbs. The external gills begin to disappear, and are replaced by lungs, allowing the tadpole to breathe air. Tadpole

6. After the tadpole's front legs have appeared it does not eat, but absorbs it's tail for food. Tadpole

7. The tail shortens, functional lungs are present and metamorphosis is nearly complete. The froglet (now around three and a half months old) can now eat small bugs and spends most of its time out of the water. Froglet

8. The froglet stays as a juvenile frog for one to two years. Froglet

9. Sexually mature frog at three years old. It is considered an adult frog once it has finished growing and has lost it's tail. Frog

10. Reproduction: clasping by the male stimulates the female to lay 500-5000 eggs. The male fertilises the eggs as they are shed, over the course of around ten minutes. Frog

11. This PowerPoint was made from the following sources: http://www.scienceclarified.com/Al-As/Amphibians.html#b http:// rde.nsw.edu.au / rm /stage1_Modules/frogs/ life_cycle_information_. htm Image for video retrieved from: http://www.frog-life-cycle.com/graphics/frog_life_cycle.jpg