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Reproduction in: Amphibians Reptiles Turtles Snakes lizards
Vet-student.mihanblog.com Reproduction in: Amphibians Reptiles Turtles Snakes lizards vet-student.mihanblog.com
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Amphibians and Reptiles
1. Most frogs and toads mate in the water with eggs being fertilized and released to attach to vegetation. vet-student.mihanblog.com
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FROG MATING vet-student.mihanblog.com
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Anurans = mating season for amphibians Rainfall can induce mating.
Amphibians reproduce sexually vet-student.mihanblog.com
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Eggs hatch into tadpoles that breathe through external gills which go through metamorphosis to become a land dwelling adult. vet-student.mihanblog.com
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Salamander Eggs are unpigmented
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Turtles mating Males get aggressive, they lock their feet in the rear of her shell, flip over and will mate for a couple of hours. She will sometimes drag him around. vet-student.mihanblog.com
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Turtles are oviparous. a. They lay eggs and deposit them in a nest cavity in the soil for them to hatch later. vet-student.mihanblog.com
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Turtles usually lay eggs in warmer months
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b. Incubation time varies from 30 days for soft-shelled turtles to 18 months for land tortoises (average is 60 – 90 days, depending on soil temperature). vet-student.mihanblog.com
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Snakes may lay eggs from 30 – 85 days after mating.
a. Eggs incubate for 40 – 90 days before hatching. vet-student.mihanblog.com
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b. Ovoviviparous snakes retain eggs in their body until they are hatched in 90 – 150 days.
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Egg Laying Snakes All pythons Kingsnakes Milksnakes Rat snakes
Corn snakes vet-student.mihanblog.com
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A group of eggs that will hatch together
CLUTCH A group of eggs that will hatch together vet-student.mihanblog.com
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Female pythons and King Cobras are 2 of only a few groups of reptiles to care for her eggs after oviposition. A female will coil around her eggs until they hatch, protecting the eggs and providing temperature regulation, as well. vet-student.mihanblog.com
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c. Some snakes are live-bearing snakes with baby snakes receiving nourishment during development from mother vet-student.mihanblog.com
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Live birth of snake vet-student.mihanblog.com
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MOST SNAKE SPECIES THAT LIVE IN COLDER AREAS ARE LIVE BEARING
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Live bearing snakes All boas All vipers Garter snakes
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Most snakes mate once a year
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Hemipenes of male snake
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Snakes mating. It may take him days to get her attention.
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Lizards MOST are egg layers. vet-student.mihanblog.com
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Egg Layers Iguanas Water dragons Geckos Veiled chameleons
Panther chameleons Monitors vet-student.mihanblog.com
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Livebearers Solomon Island skink Blue-tongue skink
Shingle-backed skink Jackson's chameleon vet-student.mihanblog.com
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a. Smaller sizes hatch in 30 days or less (anoles, geckos)
b. Large sizes take as long as 120 days (monitor lizard) vet-student.mihanblog.com
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Crocodilians lay hard-shelled eggs and deposit in soil nest for air incubation of about 90 days.
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All crocodilians guard their nests.
Crocodilians also assist the hatchlings as they emerge from their nests, and will guard them for a while after hatching. vet-student.mihanblog.com
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Did you know that the sex of a crocodile is determined by the temperature of the eggs during incubation? vet-student.mihanblog.com
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Lizards reach sexual maturity based on size, more than chronological age. Small lizards may become reproductively active at 1-2 years of age, while larger lizards may be 3-4 years old vet-student.mihanblog.com
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Males have 2 copulatory organs called hemipenes, one on each side of the base of the tail. Either one of the two hemipenes may be used for internal fertilization. vet-student.mihanblog.com
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Urination does not occur through the hemipenes.
The tissue is not erectile either. vet-student.mihanblog.com
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Female lizards have paired ovaries and oviducts. Ovaries vary in size.
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The oviducts possess both an albumin-secreting function and a shell-secreting function. There is no true uterus. The oviducts connect to and open directly into the cloaca through papillae. vet-student.mihanblog.com
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GRAVID= fertilized female lizard
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