The Ants are an army of red ants who steal food as they see them. They appeared in four Tom and Jerry cartoons: "Cat Napping", "Pup on a Picnic", "Barbecue Brawl", and "Carmen Get It!". They also appeared in Tom & Jerry Kids.
They're unusually heavy for their size, and their combined weight often causes many items, such as Tom's hammock, to break. It's unclear how or why the ants are so heavy, as they are even capable of making tables and diving boards shake as they march onto them.