Birds are defined as vertebrates – animals with backbones – that have feathers and wings. They don’t have to fly to be considered a bird, but they all have wings. Reptiles are a separate group.

You can categorize every single living being. This classification system allows scientists to study plant and animal diversity and to group closely related species. From horses to insects to worms, ...

Learn about classification of plants, animals and microorganisms with these interactive learning resources for KS2 Science students aged 7-11 from BBC Bitesize.