Foods eaten by living organisms
On the basis of their food habit, animals are of three types : 
(i)  Herbivores  : Animals which eat  plants and plant products – these are called herbivores. e.g.  Cow, sheep, deer elephant etc.  
(ii)  Carnivores :  Animals which eat flesh of other animals are called carnivores. e.g. Lion, Tiger, Fox, Wolf etc.
(iii)  Omnivores : Animals eating both plants and animals are called omnivores.e.g. Humans, crow, squirrels and cockroaches.