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

1201 American goldfinch

1202 black-capped chickadee

1203 lark sparrow

1204 Northern cardinal

1205 prairie warbler

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