American dog tick females can appear different after feeding. What is the change in their color?

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Female American dog ticks undergo a significant color change after feeding due to the engorgement of their bodies with blood. Initially, their appearance is typically a brownish color. Once they have fed, their bodies expand, and their coloration shifts to a slate-grey hue. This transformation not only helps in identifying the feeding ticks but also indicates that they are in a different physiological state, having taken in blood to support reproduction. Understanding this change is crucial for recognizing and managing encounters with these ticks, particularly in outdoor environments where they may pose a risk to both humans and pets.