Bed bugs are small, reddish-brown insects that feed on the blood of humans and animals. These nocturnal pests hide in cracks and crevices near beds and furniture during the day and emerge at night to feed. Look for signs of bed bug infestation, including reddish-brown stains on bedding, shed skins, and small, itchy bite marks on the skin. Proper identification and professional pest control services are crucial for effective elimination of bed bug infestations.