1. Reptile
Reproduction & Diseases
By Mr. “It’s a boy” Chapman

2. Reproduction Methods
 Oviparous – egg layers
 Viviparous – live birth
 Ovoviviparous – eggs stay inside of
mother until they are ready to hatch, then
the eggs hatch inside of the mother and
babies come out like live birth.

3. Turtles
 Turtles are oviparous (lay eggs that hatch
later)
 Female turtles lay eggs in a nest that they
dig (usually in the soil or sand).
 The females leave after laying eggs, no
parental care

5. Turtle Eggs
 Eggs vary in size and
amount.
 Turtles Eggs:
 - Avg. 50 eggs
 - soft and hard shells
 - avg. 60 day incubation
 Soft shell 30 day
 Hard shell 18 months

6. Turtle Mating
 Males plastron are usually concaved, so
the male can climb on the back of the
female.
 Males uses his claws on the front limbs to
grasp the front edge of the females
carapace.

8. Snakes
 Snakes may be oviparous, ovoviviparous,
or viviparous.
 Most snakes are oviparous
 Snakes lay there eggs under rocks, hollow
logs, in the ground, or anywhere warm.
 Snakes also do not provide parental care.

10. Mating
 The male and female
will wrap around each
other until their
cloacae are together.
 Females may hold the
sperm for months
until they fertilize the
egg.

11. Incubation
 The temperature of the environment
controls how fast the babies develop.
 Egg layers:
 - 30-50 days after mating
 - lay 5 to 60 eggs
 Live bearing:
 - 90 to 150 days
 - 10 to 100 babies

12. Snakes Babies
 Snakes get out of
their eggs using a
tooth on their snout
to slice the egg open
called?
 Egg Tooth

13. Lizards
 Lizards are also OV, OVOV, and VIVI, but
most are OV.
 Lizards lay eggs in holes dug in the soil.
 Dimorphism –
 Definite difference you can see between
the male and females.

14. Mating
 Males attract females by displaying bright
body colors, engage in bobbing or body
movements to attract the female.
 Once accepted by a female the male will
grasp and bite the female’s neck to hold
her down.
 Females may hold or store sperm for long
periods before fertilization.

15. Lizard Incubation
 Small lizards (geckos and anoles):
 - 30 days
 - lay 1-2 eggs
 Large Lizards (monitors)
 - 120 days
 - 50 eggs
 Lizards also have an egg tooth

16. Crocodilians
 Crocodilians are only oviparous
 Crocodilians court females like lizards, but
they mate in the water.
 Females build nest out of water
 Eggs are laid in nest and then covered up
by the mother.

17. Parental Care
 Female show amazing
parental care.
 The female will not
eat during this time.

18. Incubation
 All crocodilians lay  The amount of eggs
hard shell eggs laid depends on the
 Alligators: age and size of the
 - lay 20-30 eggs female.
 Crocs:
 - lay 60-100 eggs
 Gharials:
 - lay 40 eggs