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.

4. 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.

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

7. 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.

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

10. 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.

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

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

15. 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.

16. This PowerPoint was
made from the
following sources:
http://www.scienceclarified.com/Al-
As/Amphibians.html#b
http://rde.nsw.edu.au/rm/stage1_Mod
ules/frogs/
life_cycle_information_.htm
Image for video retrieved from:
http://www.frog-life-
cycle.com/graphics/frog_life_cycle.j
pg