By Sebastian Malysa | Updated Mar 24, 2022
Ticks rely on blood meals to grow, mature, and reproduce. After hatching, a tick immediately seeks a host using the highly specialized Haller’s organ on its front legs. This organ detects a host’s shadow, vibration, heat, and scent. Once attached, the tick feeds for 2–10 days, expanding five to ten times in size. After detaching, a fully engorged female lays thousands of eggs, beginning the cycle anew.
Ticks cannot drink water; they absorb moisture from the air. A relative humidity of 85 % or higher is essential for hydration and survival. Levels below 80 % quickly lead to dehydration and mortality. Additionally, temperatures above 44 °F (7 °C) are required for active questing. Warmer climates facilitate faster movement and increased host encounters, boosting tick success.
Ticks flourish in shaded, low‑lying vegetation that shields them from direct sun and retains moisture. Such environments allow ticks to quest for months, enhancing their chance to find hosts. Host abundance—ranging from small mammals to deer, livestock, pets, birds, and humans—also dictates tick density. Open, sun‑exposed areas limit questing time and accelerate dehydration.
A 2008 study, “What Makes Ticks Tick? Climate Change, Ticks, and Tick‑Borne Diseases,” commissioned by the National Reference Laboratory for Tick‑borne Diseases, documented a dramatic expansion of tick populations worldwide. Rising temperatures, increased rainfall, and higher humidity create ideal conditions for ticks to colonize new regions. The study reports a 400 % surge in tick‑borne diseases such as tick‑borne encephalitis, Lyme borreliosis, and other TBDs between 1973 and 2003, with an additional 30 % rise noted from 2005 to 2006.
