Define pest.

A pest is an organism, typically an animal or insect, that is considered harmful or undesirable due to its detrimental effects on human health, agriculture, property, or the environment. Pests can cause damage to crops, transmit diseases, destroy property, and disrupt ecosystems. They are often characterized by their ability to reproduce quickly and in large numbers, making it difficult to control their populations. Common examples of pests include rodents, insects (such as mosquitoes, termites, and cockroaches), birds, and certain species of plants or fungi. Effective pest control measures aim to manage or eliminate these organisms to minimize their negative impact.