The presence of chemical defenses, such as toxins or repellents that are produced by the animal’s body. These can help to deter insects or make them less attractive as a food source. However, when they die, these defenses shut down and no longer work to keep insects out.
Also, many animals have behaviors that help to protect themselves from insects when they are living. For example, they may groom themselves regularly to remove insects from their fur, or they may use body movements or vocalizations to scare off insects that get too close.
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