This Science video introduces teachers to an investigation modelling Charles Darwin’s observations of finch beaks in the Galapagos. Pupils use tweezers and fingers as beaks and rice as food, timing how much can be transferred between containers in ten seconds. This comparative test changes one variable – the beak type – while keeping others the same, such as the food, timing, and technique. Each beak type should be tested at least three times to calculate and compare mean averages.

This video is part of Kapow Primary’s Science scheme – evolution. It supports teachers in guiding pupils to evaluate results, recognise limitations in the beak model, and suggest improvements such as weighing food instead of counting grains. Pupils are encouraged to pose follow-up questions, testing other beak shapes or foods, and exploring how adaptations help animals survive in different habitats.

Science, key stage 2, Year 6, Living things: Evolution and inheritance, Lesson 4: Modelling natural selection