Something to remember: Mammals

All mammals are alike in five ways:

1. They make milk for their babies and take good care of their young.
2. They have at least some hair.
3. No mammal has more than four limbs. Limbs are legs, arms, and wings.
4. All mammals are warmblooded. This means that their body temperature stays just about the same no matter what the outside temperature is.
5. All mammals have lungs and breath air. The whale might look like a fish, but it is a mammal. It has lungs and breathes air.

Something to remember: Fish

Fish are alike in three ways:

1. All fish have gills. Gills help them to breathe in water.
2. All fish have fins. Their tail fins help them to swim.
3. Fish are coldblooded. This means that their body temperature changes when the temperature of the water changes. They slow down when the water becomes cold. They move faster when the water is warm.

Something to remember: Amphibians

All amphibians are alike in four ways:

1. All amphibians breathe with gills in water when they are born, and some breathe with lungs on land later.
2. All amphibians have smooth, moist skin.
3. All amphibians lay eggs.
4. All amphibians are cold blooded.

Something to remember: Reptiles

All reptiles are alike in three ways:

1. All reptiles breathe with lungs.
2. All reptiles are covered with dry scales.
3. All reptiles are coldblooded.

Something to remember: Birds

All birds are alike in five ways:

1. All birds have feathers.
2. All birds have wings.
3. All birds have two legs.
4. All birds breathe with lungs.
5. All birds have bills or beaks.