chapter 11 section 4 reptiles. what is a reptile? ectotherm vertebrate with lungs and scaly skin ...
TRANSCRIPT
CHAPTER 11 SECTION 4
Reptiles
What is a reptile?
EctothermVertebrate with lungs and scaly skin
Get oxygen from air (even sea turtles)Can spend entire life on landLay eggs on landExamples: snakes, lizards, turtles,
alligators
Adaptations
First vertebrates to adapt and live on landSkin
Dry, tough skin covered with scales Helps keep water in their bodies
Kidneys Organs that filter waste from the blood Waste is then excreted in a watery fluid called
URINE Kidneys concentrate urine so reptiles lose little
water
Adaptations
Eggs Internal fertilization Amniotic Egg
Egg with a shell and internal membranes that keep the embryo from drying out
Pores in shell let oxygen in and carbon dioxide out
The Amniotic Egg
Lizards and Snakes
Most reptiles alive today are lizards or snakesSkin covered with overlapping scalesShed skin/scalesWarm areasLizards: four legs, claws on toes, long tails,
external ears, movable eyelids, two lungsSnakes: no legs, no external ears, no eyelids,
one lung
Lizards/Snakes Obtaining Food
Few lizards = herbivoresMost lizards = carnivoresAll snakes = carnivores
Some snakes have venom glands attached to hollow teeth called fangs
Some snakes have long, curved teeth http://www.youtube.com/watch?v=Qy67XU6xEi8
Lizards/Snakes Movement
Lizards Walk or move
Snake Slithers, contracting and shortening bands
of muscle connected to their ribs/backbones
Alligators
Large, carnivorous reptiles that care for their young
Broad, round snoutsFew teeth visible when mouth is shutCarnivores, hunt at night
Crocodiles
Large, carnivorous reptiles that care for their young
Carnivores, hunt at nightPointed snouts, most teeth visible when
mouth is shut
Alligator and Crocodile Video Clips
http://video.nationalgeographic.com/video/animals/reptiles-animals/alligators-crocodiles/croc_american/
http://video.nationalgeographic.com/video/animals/reptiles-animals/alligators-crocodiles/alligator_protectinghatchlings/
http://video.nationalgeographic.com/video/animals/reptiles-animals/alligators-crocodiles/baby-mugger-crocodiles-predation/
Turtles
Live in fresh water, ocean, land
Land = “tortoise”Body covered by a
protective shell that includes the ribs and backbone
Some turtles can pull their head, legs, and tail inside their shell
Have sharp-edged beak instead of teeth
Carnivores and herbivores
Turtle Video Clips
http://video.nationalgeographic.com/video/news/animals-news/us-oil-spill-turtle-relocation-vin/
http://video.nationalgeographic.com/video/animals/reptiles-animals/turtles-and-tortoises/crittercam-seaturtles-missions-wcvin/
http://video.nationalgeographic.com/video/animals/reptiles-animals/turtles-and-tortoises/turtles-baby-predation/
Extinct Reptiles– The Dinosaurs
Became extinct 65 million years ago
Some dinosaurs might have been endotherms
Earliest vertebrates that had legs positioned directly beneath their bodies