Introduction to Reptiles

Reptiles are a group of vertebrate animals that differ from amphibians by laying eggs on land and living entirely on land. They are ectotherms with lungs and thick, scaly skin that prevents dehydration. Historically, reptiles, including dinosaurs, dominated the Earth. Today, there are about 7,000 species, including turtles, crocodiles, lizards, and snakes. Some, like rattlesnakes, have venom to paralyze or kill prey.

What is a key difference between reptiles and amphibians?

• Reptiles lay eggs in water.

• Reptiles can live their entire lives on land.

• Reptiles are endotherms.

• Reptiles have moist skin.

What characteristic helps reptiles prevent drying out?

• Thick scaly skin

• Feathers

• Fur

• Moist skin

During which period did dinosaurs dominate the Earth?

• 65 million to 10 million years ago

• 300 million to 225 million years ago

• 225 million to 65 million years ago

• 500 million to 300 million years ago

Approximately how many species of reptiles exist today?

• 7,000

• 5,000

• 3,000

• 1,000

Which of the following reptiles is known to have venom?

• Lizard

• Alligator

• Rattlesnake

• Tortoise