1. Mammals: have hair or fur, give birth to live
young, feed babies with mother's milk, have
baby teeth that fall out before adult teeth
come in, warm-blooded, have 3 middle ear
bones

2. Fish: most are cold-blooded (though
tuna, swordfish and some shark
species are warm-blooded), live in
water, lay eggs, have scales, have
fins, breathe using gills

3. Birds: most can fly (ostriches and
penguins cannot), have wings and
feathers, lay eggs, have hollow
bones, warm-blooded -

4. Amphibians: cold-blooded, live in
the water AND on land, do not have
scales, have permeable skin
(molecules and gases can pass
through), have gills for at least part
of their lives, have moist skin, have
webbed feet -

5. Reptiles: have scales, breathe with
lungs, most lay eggs (boa constrictor
gives birth to live young), most are
cold-blooded (sea turtle is warm-
blooded), have dry skin

6. Sort these animals!
Amphibians Mammals Reptiles Birds Fish

7. Classify These Characteristics
Amphibians Mammals Reptiles Birds Fish
Has scales Lay eggs
Cold blooded
Lives in
water and
on landGives birth
to live
young
Breathe
using
gills
Has
hair or
fur
Feed
babies
with
mother’s
milk
Cold
blooded
Has
feathers
Lay eggs
Hollow
boned
Warm
blooded