Vertebrate and invertebrate

Overview

In this lesson students classify common animals as vertebrates or invertebrates using agreed observable criteria. Students then model a “spine” with pipecleaners to help them remember the key feature used in the taxonomy.

Learning intentions

• WALT classify animals as vertebrates or invertebrates using observable features.
• WALT describe how taxonomy groups living things into categories using accepted criteria.
• WALT use scientific vocabulary to explain why an animal belongs in its category.

Success criteria

• I can sort animal picture cards into vertebrates and invertebrates.
• I can explain that vertebrates have a spine/backbone and invertebrates do not (as a general rule).
• I can justify my sorting using one or more observable features.

Curriculum links

• Biological Science / Organism / Diversity / Taxonomy: classifying animals as vertebrates or invertebrates.
• Biological Science / Taxonomy: using accepted criteria and observable features to divide organisms into categories.
• Science capabilities (where appropriate): using evidence from observations and communicating ideas.

Lesson structure (30 minutes)

1. 0–3 min · Hook (Think). Teacher shows two large images: a fish and a snail (or a bird and a spider) and asks, “What’s one body feature that might help us sort them?” Students think silently, then share one idea with a partner.

2. 3–8 min · Direct teaching (Mini-lesson + model). Teacher introduces the classification idea: animals can be vertebrate or invertebrate; vertebrates include fish, amphibians, reptiles, birds, mammals; invertebrates include molluscs (snails and slugs), worms, spiders, insects. Teacher explains the key criterion for today’s grouping: the presence of a spine/backbone (general rule). Students repeat the two category names and say the criterion aloud in a class chorus.

3. 8–12 min · Shared investigation (Picture sort justification). Teacher gives pairs 8–10 animal picture cards (mixed) and a two-column sorting sheet labelled “Vertebrate” and “Invertebrate.” Students sort cards and circle which ones feel “trickiest,” then prepare one sentence: “I put ___ in ___ because…”

4. 12–20 min · Practical: spine with pipecleaners (Hands-on model). Teacher hands out pipecleaners and a short “body strip” template (paper strip) showing where a spine would sit. Teacher demonstrates building a simple spine model and placing it on vertebrate models. Students work through a quick station task:

• Choose one vertebrate card: build a “spine” with pipecleaners on the paper strip.
• Choose one invertebrate card: decide where (if at all) a visible spine would be in the model, and write a brief explanation on the back of the card (“This animal is invertebrate because…”). Teacher circulates, checking that students use the criterion rather than guessing by skin/size/colour.

5. 20–26 min · Whole-class check (Classification challenge). Teacher displays 6 mixed animal cards (including at least one potentially confusing one such as an insect vs. a worm; or a bird vs. a fish). For each card, teacher asks: “Should it be vertebrate or invertebrate, and what’s our evidence?” Students hold up either a green card (vertebrate) or red card (invertebrate), then one student gives the justification sentence.

6. 26–30 min · Exit ticket (Quick assessment). Students complete a short exit ticket:

• Sort 3 small picture icons (2 correct + 1 selected “trick” card).
• Write: “A vertebrate has… / An invertebrate does not…” (one sentence).

Resources

• Printed animal picture cards (mixed set) including: fish, amphibian, reptile, bird, mammal, snail/slug, worm, spider, insect
• Two-column sorting sheet with headings: “Vertebrate” and “Invertebrate”
• Pipecleaners (one per student plus extras) and paper “body strip” templates
• Coloured response cards (green for vertebrate, red for invertebrate)
• Exit tickets (3-card sort + one-sentence prompt)
• Markers/pencils and classroom timer
• Visual display of examples of vertebrates and invertebrates (teacher prepared)

Assessment

• Formative: observe pair sorting and listen to justification sentences during the picture sort (8–12 minutes).
• Formative: teacher checks pipecleaner models and explanations during the practical (12–20 minutes).
• Summative (informal): exit ticket sorting accuracy and the clarity of the one-sentence criterion statement.

Differentiation

• Support:
• Provide sentence starters on the sorting sheet: “I put ___ in vertebrates because it has a spine/backbone.”
• Use a word bank: vertebrate, invertebrate, spine/backbone, fish, snail, worm, spider, insect.
• Offer an example “model answer” at the front after the first pair sorting attempt.
• Extension:
• Ask: “Give one reason we still use ‘spine/backbone’ as our evidence, even if an animal looks different from others.”
• Challenge students to spot where a typical assumption might fail (e.g., comparing an insect and a worm—both are invertebrates).
• EAL/SEN:
• Keep categories consistent on every sheet (same headings and colours).
• Reduce cognitive load by limiting the first sort to 8 cards, then adding more during the whole-class challenge.
• Hands-on access:
• Allow students who need it to work with a partner during the pipecleaner model and verbalise their reasoning while the teacher records it on a checklist.