Burs are small, seed-like structures that develop on certain plants, allowing them to spread their seeds effectively. They often have hooks or spines that cling to fur, clothing, or other surfaces, helping the seeds travel to new locations. This method of seed dispersal is known as epizoochory. Common examples of plants that produce burs include burdock and cocklebur. These plants have evolved this feature to increase their chances of germination and growth in different environments. Burs can be a nuisance when they attach to pets or clothing, but they play a crucial role in the life cycle of these plants.