Field crickets are the culprits behind the chirping that you hear during summer nights. They generally are around half an inch to an inch long, and are a dark black, red, or brown. Normally the field cricket is found in tall grass or piles of plants. They will feed on animal remains and plant matter, and they are very helpful in pest management plans because they also will eat the eggs and pupae of more harmful pest insects. However they are definitely still pests themselves as they will eat plants that humans use for food so they can be destructive in gardens. In my circumstances you will not need to worry about field crickets coming into the house, as they prefer to live outdoors in the moist soil and around their food source. They would only come inside when the weather drops to very low temperatures.