Free printable science worksheets and charts

Animal Classification Worksheet

Pick a sheet and get animal pictures to cut and sort into groups, plus fill-in and matching activities and an answer key.

This animal classification worksheet maker builds printable sheets for sorting animals into vertebrate and invertebrate groups, and into mammals, birds, fish, reptiles and amphibians. It runs in your web browser, is free, and needs no sign-up. You tick the activities and options, and the printable pages update live. Picture sorts suit young children, vertebrate groups suit grades 2 to 5, and trait clues suit grades 4 to 6, so the tool covers animal classification KS1, animal classification KS2 and kindergarten lessons. Animal habitats worksheets are included too: one sheet sorts animals by where they live. Nothing you make is uploaded or sent to a server.

How to make an animal classification worksheet

  1. Open the Worksheet menu and pick one of the four sheets: Vertebrate groups, Vertebrates and invertebrates, Animal habitats or Classify by traits.
  2. Look at the activities on the left. Each sheet opens with two or three ticked by default. Tick or untick any others. Only activities the topic supports are offered.
  3. Set Word bank on or off. Off makes the sheet harder.
  4. Set Items per activity to 4, 6, 8, 10 or 12. This sets how many problems the generated activities make.
  5. Turn Color pictures on for soft colors, or off for black line art that children can color and that saves ink.
  6. Edit the Worksheet title, add a Name and date line if you want one, and choose US Letter or A4.
  7. Turn on Answer key pages if you need them. Answers appear in blue.
  8. Check the pages on the right. They update as you change options.
  9. Click Download PDF for a file, or Print to open the print dialog with only the worksheet pages.

New version shuffles the word bank, matching letters and order, so each class or student can get a different sheet. Copy link saves the current version in a link that reopens the same worksheet.

What are the 5 groups of vertebrates?

The five groups of vertebrates are mammals, birds, fish, reptiles and amphibians. Every vertebrate has a backbone, and each group has features that set it apart.

Mammals have hair or fur and feed their young milk. Birds have feathers, wings and a beak, and they lay eggs. Fish live in water, breathe with gills, and most have scales and fins. Reptiles have dry, scaly skin. Amphibians have smooth, moist skin, and most start life in water.

Mammals and birds are warm-blooded. Fish, reptiles and amphibians are cold-blooded. Examples on the worksheet include dog, bat and dolphin for mammals, and penguin and eagle for birds.

What is the difference between vertebrates and invertebrates?

Vertebrates have a backbone, and invertebrates do not. Most animal species are invertebrates, so the invertebrate group is far larger than the vertebrate group.

Invertebrates on the worksheet include bee, spider, snail, jellyfish, octopus and crab. Insects have six legs and three body parts. Spiders, which are arachnids, have eight legs and two body parts, so a spider is an invertebrate but not an insect.

Why is a dolphin a mammal and not a fish?

A dolphin is a mammal because it breathes air with lungs and feeds its young milk. Fish breathe with gills, and a dolphin does not.

Dolphins live in water and have fins, which is why they are often mistaken for fish. Those features are not what decides the group. A whale is a mammal for the same reasons, and so is a bat, even though a bat flies.

What is an animal habitat?

A habitat is the place where an animal lives and finds food, water and shelter. The Animal habitats sheet sorts twelve animals into five habitats: ocean (shark, dolphin, octopus), desert (camel, scorpion), forest (owl, deer), polar (polar bear, penguin) and grassland (zebra, lion, elephant). Each animal has adaptations, body parts or behaviors that help it live there: a camel can go a long time without drinking, and a polar bear has thick fur and a layer of fat against the cold.

Frequently asked questions

Is there an answer key?

Yes. Turn on Answer key pages to add pages with the answers filled in, shown in blue. For the generated activities, the tool calculates the key for every new set of problems.

Which ages is it for?

Picture sorts and habitats suit KS1 and grades K–3, including kindergarten. Vertebrate groups suit grades 2–5. Trait clues and invertebrate vocabulary suit KS2 and grades 4–6.

Can I make a different version for each student?

Yes. Click New version to shuffle the word bank, the matching letters and the order. The version is kept in the link, so you can share the exact sheet you chose.

Does the tool store my worksheets?

No. The tool runs in your browser, and nothing is uploaded or sent to a server.

Can I print only the worksheet pages?

Yes. Print opens the print dialog with only the worksheet pages, so the tool’s controls do not appear on paper.

Can kindergarten children do the picture sort?

Yes. The picture sorts need no reading beyond the column names: children cut out the animal cards along the dashed lines and glue each one in the right column. Turn off Color pictures and the cards become line art they can color first.