Scholars and schoolchildren alike have generally classified animals by the foods they eat: carnivores eat meat; browsers consume flowering plants, conifers and shrubs; and grazers focus on grasses.

v. 1. Histological classification of bone and joint tumors of domestic animals / compiled and reviewed by M.V. Slayter [and others] -- v. 2. Histological classification of mesenchymal tumors of skin ...

There are millions of different types of living things on Earth. In order to keep track of them all, scientists put living things into groups based on characteristics that they have that are the same.