A cat uses its whiskers to determine if a space is too small to squeeze through. The whiskers act as feelers or antennae, helping the animal to judge the precise width of any passage.
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How good is a dog's hearing ability?
Dogs have a great sense of hearing. In fact, it is their second most developed sense (next to smell). Not only can they detect sounds that are much too faint for humans, but they also can hear sounds pitched at frequencies above or below a human's range. Dogs can hear in the range of 67 HZ to 45 kHZ (compared to a high range of 20 kHZ in humans).