The deer tick, also known as the black-legged tick, is a small arachnid commonly found in wooded and grassy areas. It is known for its role in transmitting diseases, particularly Lyme disease, which can affect both humans and animals. Adult deer ticks are typically active in the fall and spring, while nymphs are most active in the summer. Deer ticks are usually about the size of a poppy seed, making them difficult to spot. They feed on the blood of mammals, including deer, which is how they acquire and spread pathogens. Proper tick prevention measures, such as wearing protective clothing and using insect repellent, can help reduce the risk of bites.