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Rats are among the most troublesome and economically significant pests in the world. Two introduced species of rats, roof rats and Norway rats, are present in almost all cities across California, and are particularly widespread in San Francisco and Los Angeles. Their populations are likely to increase dramatically in coming years as rodenticides are banned in most cases. Rats are pests because they may eat and contaminate food and damage structures and other property. Rats can also transmit parasites and diseases to humans and other animals and have been associated with medically significant allergic responses in humans. Dr. Quinn will discuss the ongoing and increasing threat posed by invasive rat species and how homeowners can effectively fight the battle by correctly using snap traps.