Rainsford imitates the foxes and cats he has hunted in the past, staying in an impenetrable state of alert.
Rainsford has hunted many animals and knows how they behave after observing them for a long time. He decided he needed to imitate these behaviors to survive and for that reason, he chose to imitate cats and foxes.
This is because these animals were more instinctive, observed the environment cautiously, and emphasized the use of smell and hearing to stay in a constant state of alert.
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