Close-up of the mouth parts of the brown dog tick showing secretion. When humidity rises above 41%, the hydrophilic secretion absorbs the moisture and is drawn back into the tick. Created by Emily Harrington of eh illustration, http://www.ehillustration.com. This work shall be and remain at all times the shared property of Emily Harrington and the Biomimicry 3.8 Institute, and Emily Harrington grants to the Biomimicry 3.8 Institute a non-terminating, nonexclusive, non-limiting right to use the materials for educational purposes. Any use by outside parties requires permission from Emily Harrington and can be requested from [email protected] or through the Biomimicry 3.8 Institute.