The group of animals that chew the cud are "ruminants."
Ruminants are a group of mammals that include animals such as cattle, sheep, goats, buffalo, and deer. These animals have a unique digestive system that allows them to break down tough plant material, such as grasses and leaves, by regurgitating and re-chewing their food (known as cud). This process helps to release more nutrients from the plant material, which can then be absorbed by the animal's digestive system.
Amphibians, aves (birds), and reptiles do not chew the cud and have different digestive systems.