Define what a pest is.

A pest is any organism that is considered harmful or destructive to humans, crops, livestock, or property. Pests can include insects, rodents, birds, and other animals that can cause damage or spread disease.

A pest is an animal, plant, fungus, or microorganism that is detrimental to humans, their economic interests, or the environment. Pests can cause damage to crops, livestock, forests, and other natural resources. They can also transmit diseases to humans and animals, and cause annoyance and discomfort.