This order comprises rollers, common kingfishers, tree kingfishers, ground rollers, todies, motmots and bee-eaters. It also used to include hoopoes, green wood hoopoes and hornbills, which are now included in Bucerotiformes. Coraciiformes are very colourful birds, but the families that make up this order are relatively different from a morphological, ecological and behavioural point of view. Their legs are syndactyl, i.e. their first toe is facing backwards and opposite their second, third and fourth toes, the latter two being joined at their base. They form the sister group to Piciformes.