Ruminants such as cows and buffaloes swallow their food hurriedly and then sit restfully and chew their food

Ruminants such as cows and buffaloes swallow their food hurriedly and then sit restfully and chew their food. Can you reason why?

Answer:
This is done for complete digestion of the food. When the food is swallowed by ruminants, it is only partially digested. It is then again chewed for its complete digestion.