Northern Cardinal Bird Sound Natural sound of singing birds - Both male and female Northern Cardinals sing. The song is a loud string of clear down-slurred or two-parted whistles, often speeding up and ending in a slow trill. The songs typically last 2 to 3 seconds. Syllables can sound like the bird is singing cheer, cheer, cheer or birdie, birdie, birdie. Males in particular may sing throughout the year, though the peak of singing is in spring and early summer.