Ticks can be the size of poppyseeds. They hang out on the highest blade of grass/bush/tree trunk to wait for an animal or human to brush up against it to climb aboard. The article below is about the importance of repellent. Take a second to read!
“Ticks that cause Lyme Disease, the nymphal ticks, are on the ground or barely above the ground. They just don’t climb very high. So get your shoes and socks, don’t leave them unsprayed. And those tick checks are very very important.”