Reptile repro. and diseases


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Reptile repro. and diseases

  1. 1. ReptileReproduction & Diseases By Mr. “It’s a boy” Chapman
  2. 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. 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
  4. 4. 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
  5. 5. 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.
  6. 6. 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.
  7. 7. 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.
  8. 8. 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
  9. 9. Snakes Babies Snakes get out of their eggs using a tooth on their snout to slice the egg open called? Egg Tooth
  10. 10. 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.
  11. 11. 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.
  12. 12. 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
  13. 13. 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.
  14. 14. Parental Care Female show amazing parental care. The female will not eat during this time.
  15. 15. 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