Chapter 1
The great evolutionary split
Chapter 2
Skin, lungs, and breathing secrets
Chapter 3
From jelly eggs to tough shells
Chapter 4
Mastering the extremes
YOUR GOAL
Master of Amphibians and reptiles
Ch 3 · From jelly eggs to tough shells
sonia Amphibians and Reptiles
Amphibians lay their jelly eggs in water, soft and bright, But reptiles use their tough-shelled eggs on land, bathed in sunlight!
sonia Amphibians have evolved some of the wildest parenting strategies in the animal kingdom to protect their soft eggs.
sonia Reptile eggs contain a complex life-support system that allows embryos to develop safely on dry land.
BETA
sonia Sort creatures from squish to shell to discover how amphibians and reptiles differ.
Fun Fact
Vocal sac nurseries: Male Darwin's frogs keep their developing tadpoles safe inside their vocal sacs until they hop out as froglets.
Glossary
amniotic egg (noun)
A shelled egg containing specialized membranes that protect and nourish a developing embryo. This evolutionary milestone allowed early reptiles to colonize dry land during the Carboniferous period.
A shelled egg containing specialized membranes that protect and nourish a developing embryo. This evolutionary milestone allowed early reptiles to colonize dry land during the Carboniferous period.
Quiz
For green sea turtles, what environmental factor determines the biological sex of the hatchlings?
Quiz
Which membrane in the amniotic egg is responsible for storing the embryo's nitrogenous waste?
Quiz
Where does the male Darwin's frog shelter its tadpoles until they are fully developed?