







Mammals
Have hair or fur at some stage of life.
Females produce milk to feed their young.
Most give birth to live young.
Examples: lion, dolphin, bat.
Birds
Have feathers and beaks.
Have wings.
Lay eggs.
Examples: penguin, eagle, ostrich.
Reptiles
Have dry, scaly skin.
Breathe using lungs.
Most lay eggs, although some give birth to live young.
Examples: snake, tortoise, crocodile.
Amphibians
Usually have moist skin.
Often begin life in water and undergo metamorphosis.
Many lay eggs in water.
Examples: frog, toad, newt.
Fish
Live in water.
Breathe through gills.
Most have fins and scales, although there are exceptions.
Examples: salmon, clownfish, shark.

