Both sexes are accomplished songsters and may be heard at any time of year. Cardinals will mate for life and remain together throughout the entire year. That's why you will usually see a male and female together at your feeding station.
Male and female Cardinals both sing. Songs are loud, beautiful whistled phrases. Some songs you may hear sound like "whoit whoit whoit" and "whacheer whacheer." These songs are used in forming territories and in courtship. Male and female cardinals use "chirps" as contact calls and alarms. They also have many visual displays such as "tail-flicks" to signal alarm. The crest may be raised and lowered. Strongly territorial, males will fight other males, along with their own reflection in windows!