Medically reviewed by Amelia MacIntyre, DO Ticks are small parasites that feed on the blood of humans and other warm-blooded animals. They are most active in late spring, summer, and early fall. Tick ...

All types are very small. The largest tick may swell to the size of an apple seed after it feeds, but many ticks are much smaller than that. Ticks are flat before they feed.

Because ticks are often very small, you might not notice them. At first, their bites might just look like specks of dirt. But as the tick feeds, it swells up and can be easier to spot.

They're very small and they can still attach and bite.” The official says that when living in an environment with ticks, it is important to be cautious and stay safe.

Here's what to know about the Asian longhorned tick, first confirmed in the U.S. in 2017 in New Jersey. The ticks have spread ...

A University of Arizona researcher is part of an effort to identify the diseases carried by ticks, and she's asking people to send her samples.

These ticks are very small and prey mainly on small mammals. As you might have guessed from their name, their favorite blood comes from hares and rabbits.

Here's what to know about the Asian longhorned tick, first confirmed in the U.S. in 2017 in New Jersey. The ticks have spread to 21 states.