Since land animals have descended from the creatures living in the sea their body fluid is still the same as before, moving to the land. As they cannot obtain salt from plants or land so they require more salt. It’s the herbivores like giraffe and mouflon etc. need more salt for the plants do not contain much salt as they are drained away by the rain water.
Carnivores animals get the salt from the body fluid of their prey. Their tongues get sore; for healing salt is rubbed on their tongues.
Below Carnivores Animals info from Wikipedia (Read More):-
A carnivore (pronounced /ˈkɑrnɪvɔər/), meaning 'meat eater' (Latin carne meaning 'flesh' and vorare meaning 'to devour'), is an animal that derives its energy and nutrient requirements from a diet consisting mainly or exclusively of vertebrate and/or invertebrate animal tissue, whether through predation or scavenging.[1][2] Animals that depend solely on animal flesh for their nutrient requirements are considered obligate carnivores while those that also consume non-animal food are considered facultative carnivores.[2] Omnivores too consume both animal and non-animal food, and apart from the more general definition, there is no clearly defined ratio of plant to animal material that would distinguish a facultative carnivore from an omnivore, or an omnivore from a facultative herbivore, for that matter.[3] A carnivore that sits at the top of the foodchain is an apex predator.
http://en.wikipedia.org/wiki/Carnivores
