The cardinal has a loud and clear whistle. Whistles are often reminders to listen closely — to pay attention to what is blowing on the winds. In the case of the cardinal, the female joins in on the whistling, which is unusual among birds. This reflects that we should be listening to the inner voice (the feminine) more closely for our own health and well-being. Since most female birds usually are quiet and camouflaged, a cardinal totem almost always reflects a need to assert the feminine aspects of creativity and intuition more strongly.
All cardinals are beneficial and friendly. They eat many weed seeds and injurious insects. The seventeen-year locust (cicada) is one of these. Cardinals can reflect a need to be more careful about your diet, that what you are eating may be injurious to yourself and affecting your overall vitality.
~ Ted Andrews, Animal Speak