Mammals
This is the number of limbs that mammals have.
What is 4?
Birds do not have live young, instead they do this.
What is lay eggs?
A reptile's body is covered with these hard folds that make up their skin.
What are scales?
Unlike most other animals, fish do not live on land, they live here.
What is in the water?
Like mammals, amphibians are vertebrates, which means they have this.
What is a back-bone?
In order to feed their young, mammals produce this.
What is milk?
A bird does not have fur, hair, or scales all over its body, they have these.
What are feathers?
Reptiles need to be in a warm environment because their bodies do not keep blood warm and they change temperature when the temperature changes around them. This means they are called this.
What is cold-blooded?
Fish can lay up to 1000 of these in order to produce their young.
What are eggs?
Unlike reptiles who have scales, amphibians' skin can be described as this.
What is smooth and moist?
Even though a bat has these, it is still considered a mammal.
What are wings?
To help birds fly, many of their bones are this.
What is hollow?
Some reptiles, such as particular snakes, will give birth to live young, but most will do this.
What is lay eggs?
Although it looks like a whale, this large fish is not a mammal.
What is a shark?
The temperature of amphibians' bodies changes with their environment, if it is cold they are cold, if it is hot they are hot, because they are this.
What is cold-blooded?
Some mammals stay up all night and sleep during the day. They are called this.
What is nocturnal?
Although birds can eat many hard and chewy things, they do not have these.
What are teeth?
Reptiles have a backbone, which means they are called this.
What are vertebrates?
In the water, fish use these to take in oxygen.
What are gills?
When the temperature is too cold, some amphibians' will do this until the weather warms up again.
What is hibernate?
In order to breath, mammals always have this organ inside of them.
What are lungs?
Birds shed old feathers and grow new ones, which is called this.
What is molting?
Even though most reptiles have four limbs, this reptile actually has no legs.
What is a snake?
Fish use these for balancing, steering and stopping in the water.
What are fins?
Amphibians are unique animals because they breathe through this body part.
What is their skin?