3D shapes have three dimensions - length ... Look at how these shapes have been sorted. Remember a quadrilateral is any shape with 4 straight sides. Now the shapes have been sorted using a ...

3D shapes have three dimensions - length ... Look at how these shapes have been sorted. Remember a quadrilateral is any shape with 4 straight sides. Now the shapes have been sorted using a ...

The crows had learnt this basic ability from past training, but they had never before encountered only quadrilateral shapes. This ensured the test measured natural, not learnt, behaviour.