BED BUGS

Native to North America, and found from British Columbia south into California, and east into the Rocky Mountains.

It is believed that this bug originally evolved with bats living in caves in the Middle East, but in the United States it appears now to be wholly a human pest. It has been associated with humans for thousands of years.

Possibly native to North America, and an extremely common pest in association with swallows and their nests.

Possibly from Africa or Asia, but found occasionally in the United States as a parasite of humans or bats. It appears to be most common in Florida, preferring to live in warm, humid climates.