Vertebrate Detectives

Overview

This is lesson 7 of 10 in the Support and Movement unit. Students build on learning about internal skeletons, bones and muscles by classifying animals according to whether they have a backbone as part of an internal skeleton. They use evidence from images or safe specimens and explain their decisions using scientific vocabulary.

Learning intentions

• WALT identify whether an animal is a vertebrate or an invertebrate.
• WALT explain that vertebrates have an internal skeleton, including a backbone.
• WALT use observations and evidence to classify animals.
• WALT communicate our scientific thinking clearly.

Success criteria

• I can sort animals into vertebrates and invertebrates.
• I can explain that a vertebrate has an internal skeleton with a backbone.
• I can identify examples such as a slug and jellyfish as invertebrates.
• I can give a reason for my classification.

Curriculum links

• Biological Science — humans and some other animals have internal skeletons and muscles for support, protection and movement.
• Biological Science — investigating how muscles and bones interact during physical activities.
• Biological Science — applying simple observation and recording techniques to understand body structures and movement.
• Science capabilities — observing, classifying, communicating evidence and asking questions.

Lesson structure (30 minutes)

1. 0–4 min · Hook and recall. Open with the animal mystery hook and show a striking animal image, such as a jellyfish beside a dog; ask, “Which animal has a backbone inside its body?” Students silently predict, then share what they remember about bones and internal skeletons with a partner.

2. 4–9 min · Direct teach. Use the vertebrate and invertebrate teaching slides to introduce vertebrate and invertebrate. Explain that vertebrates have an internal skeleton with a backbone, while invertebrates do not have a backbone; clarify that some invertebrates may have other forms of support, such as a shell or a soft body. Students repeat the key definitions and make a backbone shape with one finger.

3. 9–17 min · Investigation sort. Organise 25 students into five groups of five. Give each group animal image cards or safe, teacher-provided specimens and the animal classification recording sheet. Students sort animals into “vertebrate” and “invertebrate” groups, record their decisions and choose two animals to explain. Include familiar examples such as dog, fish, bird, lizard, worm, slug, spider and jellyfish. Remind students to observe without touching living animals unless directed.

4. 17–23 min · Evidence discussion. Return to the sorting instructions and discussion prompts. Invite groups to share one classification and their evidence. Ask, “What evidence would help us decide?” and “Why is a jellyfish an invertebrate even though it moves?” Address the misconception that every animal with a hard covering is a vertebrate: a shell or outer covering is not an internal backbone. Students use the sentence frame, “I classified the ___ as a ___ because ___.”

5. 23–27 min · Individual application. Students complete the final section of the animal classification recording sheet independently: classify three new animal images and write one explanation. Circulate and ask individuals to identify the evidence behind each answer rather than relying on memorised labels.

6. 27–30 min · Plenary and exit check. Show the final challenge and exit prompt. Students answer orally or on the worksheet: “Is a slug a vertebrate or an invertebrate? Explain why.” Select two contrasting responses to discuss, then collect worksheets to identify next steps for lesson 8.

Resources

• the animal classification slide deck
• the animal classification recording sheet
• Animal images or safe teacher-provided specimens
• Five sorting areas or hoops labelled “Vertebrate” and “Invertebrate”
• Whiteboard and markers
• Pencils and clipboards, if working away from desks
• Optional document camera for sharing group evidence

Assessment

• Listen during the hook and direct teaching for accurate use of backbone, internal skeleton, vertebrate and invertebrate.
• During group sorting, check whether students classify using evidence rather than appearance alone; question misconceptions about shells and outer coverings.
• Use the individual worksheet and exit response to assess whether students can classify a slug and jellyfish correctly and explain that they do not have a backbone.

Differentiation

• Provide a word bank with vertebrate, invertebrate, backbone, internal skeleton, shell and soft body. Use the sentence frame, “The ___ is a ___ because it has/does not have a ___.”
• Pair students strategically and provide fewer, highly familiar animals before introducing less familiar examples. Read worksheet instructions aloud and use clear, high-contrast images for students with visual, reading or processing needs.
• For EAL learners, gesture “inside” and “backbone”, rehearse the terms orally and allow drawing, pointing or verbal explanation before writing.
• Support students who may be uncomfortable with specimens by offering photographs and ensuring all handling is optional and teacher directed.
• Extend confident students by asking them to explain why an animal’s movement does not always reveal whether it is a vertebrate, or to identify what further observation could provide evidence.