A<unk>  is a small collection of hair or fur formed in the stomach of animals that is occasionally vomited up when it becomes too big.<unk> s are primarily a tight elongated cylinder of packed fur, but may include bits of other elements such as swallowed food.<unk> s are sometimes mistaken for other conditions of the stomach such as lymphosarcoma, tuberculosis, and tumour of the spleen. Cats are especially prone to<unk>  formation since they groom themselves by licking their fur, and thereby ingest it. Rabbits are also prone to<unk> s because they groom themselves in the same fashion as cats, but<unk> s are especially dangerous for rabbits because they cannot regurgitate them. Because the digestive system of a rabbit is very fragile, rabbit<unk> s must be treated immediately or they may cause the animal to stop feeding and ultimately die due to dehydration. Cattle are also known to accumulate<unk> s, but as they do not vomit, these are found usually after death and can be quite large.
Hairball
Bejel
Cypress
Wart
Seafood
Firefighter
Wonder 
Fly