
Deer ticks go through 3 life stages, larvae, nymph, and adult. Most people with deer tick bites get bitten by a nymph or an adule female. A nymph is 1-2 mm long (C), about the size of a poppy seed. An adult female deer tick is 3-5 mm long (A), about the size of a sesame seed. Please refer to the image above to see how deer ticks in their different stages compare in size: adult female (A), adult male (B), nymph (C), larva (D).