Burs, also known as burrs, are small, rough, and prickly seedpods that attach themselves to clothing, hair, and animal fur. There are several synonyms for the word burs, including spines, thorns, prickers, barbs, and quills. These synonyms refer to similar objects that have sharp or prickly tips and can cause irritation and discomfort if they come into contact with human skin. Burs, and their synonyms, are found in many different plant species, including trees, shrubs, and grasses, and have evolved as a defense mechanism against herbivores. While they may be a nuisance for humans, burs play an important role in nature and the ecosystem.