Doug Wechsler / American dog tick (Dermacentor variabilis) adult female, PA, Morris Arboretum, Philadelphia, Pennsylvannia, USA, June.

Doug Wechsler / American Dog Tick / Wood tick (Dermacentor variabilis) adult on skin full of blood; Schuylkill Center, Pennsylvania, USA

Shattil & Rozinski / Wood tick {Dermacentor variabilis} on human skin, North Dakota, USA

Joel Sartore / Photo Ark / Tracking shot of an American dog tick (Dermacentor variabilis) female, Lincoln, Nebraska, USA. Controlled conditions.

Doug Wechsler / American dog tick (Dermacentor variabilis), vector for Tularemia and Rocky Mountain Spotted Fever, on wood, Montgomery County, Pennsylvania, USA. June.