This animal group is covered in feathers.
bird
Fish, amphibians and reptiles are this.
cold-blooded
This is the only group that feeds milk to their young.
mammals
Platypus
mammal
This vertebrate group has bumpy, leathery skin.
reptile
Mammals are one of the two vertebrate groups that are this.
warm-blooded
This group comes from the Latin term meaning "both sides of life".
amphibians
Snake
reptile
This vertebrate group have scales for protection.
fish
This refers to body temperatures that vary or change with the environment.
cold-blooded
These are used for breathing underwater.
gills
Shark
fish
A unique characteristic of this group is that they are covered by hair or fur.
mammals
Animals that are this are able to keep their body temperature constant.
warm-blooded
Animals without a backbone
invertebrates
Newt
amphibian
This group has outer coverings made up of smooth, moist skin.
amphibians
Name another warm-blooded vertebrate besides mammals.
birds
People who study animal characteristics
zoologist
Penguin
bird