In 1830 John Edward Gray commenced the Illustrations of Indian Zoology, a series of plates of vertebrated animals, G w but mostly of birds, from drawings, it is believed by dlcke..
These experiments have shown that Arthropods also have their likes and dislikes in the matter of insect-food and frequently refuse to eat insects which are warningly coloured and are distasteful to vertebrated enemies.
They present a strong family likeness which is not found in any other terrestrial vertebrated animals with exception of some lizards and possibly Caecilians amongst the Amphibia.
Mammals, then, are vertebrated animals, possessing the normal characteristics of the members of that primary division of the animal kingdom.
