Solution:
The grass-eating animals that have a rumen to partially digest food and form cud are known as ruminants.
The grass that ruminants feed on is rich in cellulose which is a type of carbohydrate.
Horses and Rabbits have a sac-like structure known as the Caecum present between the oesophagus and the small intestine.
It helps in the digestion of cellulose.
