A chigger is a small, parasitic insect that lives in tall grass. It's color can range from bright red to brown. Chiggers are almost too small to see with the naked eye, so checking grass for them is near impossible. Chigger bites appear 2-3 weeks after a host is bitten, and can last for a few weeks. Chigger's bite in hot, moist places.
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Chigger Facts for Kids. Kiddle Encyclopedia.