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🦎 Grouping Living Things

Scientists sort animals into groups by their shared features. Meet the mammals, birds, fish, reptiles, amphibians, and insects.

lessons

~15 min

to learn

🔬 Science

subject

Ages 6–12

level

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What you’ll learn

Sorting the Animal KingdomUnderstand that animals are grouped by shared features, split first into vertebrates and invertebrates.Scientists group animals by the features they share. The first big split is the backbone: vertebrates have one and fall into five groups, mammals, birds, fish, reptiles, and amphibians, while invertebrates like insects have no backbone.
The Vertebrate GroupsLearn the key features of mammals, birds, fish, reptiles, and amphibians.The five vertebrate groups each have key features. Mammals have fur and feed babies milk, birds have feathers and beaks, fish have gills and scales, reptiles have dry scaly skin, and amphibians live in water and on land, like a frog changing from tadpole to adult.
Insects and InvertebratesLearn what makes an insect and practise sorting animals into their groups.Insects are invertebrates with no backbone, identified by six legs and a body in three parts. They are the largest animal group. Using features like fur, feathers, scales, and legs, any animal can be sorted into its correct group.

Questions this course answers

What is the main difference between vertebrates and invertebrates?

Vertebrates have a backbone, while invertebrates, like insects, have no backbone.

Which feature belongs to mammals?

Mammals have fur or hair and feed their babies milk, and they are warm-blooded.

What do fish use to breathe underwater?

Fish breathe through gills, which take oxygen from the water instead of the air.

What makes amphibians like frogs special?

Amphibians live part of their lives in water and part on land, with moist skin and no scales.

In a frog's life cycle, what hatches from the eggs first?

Frog eggs hatch into tadpoles, which swim and breathe through gills before growing legs.

How can you tell an animal is an insect?

An insect has six legs and a body in three parts: head, thorax, and abdomen.

Grounded in trusted sources

National Geographic Kids
Smithsonian
Britannica Kids
San Diego Zoo Wildlife Explorers

Every Wunder lesson is built from real, reputable sources — never invented.

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