For recordings of bird songs, call 612-673-7800, and when prompted press the following four-digit numbers:

1220 greater prairie chicken

1221 mourning dove

1222 red-winged blackbird

1223 ruffed grouse

1224 trumpeter swan

1225 wild turkey

Recordings from the Library of Natural Sounds, Cornell Laboratory of Ornithology. Try the lab's website: www.birds.cornell.edu.