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

1238 Bell's vireo

1237 black-capped chickadee

1236 common loon

1235 Northern cardinal

1234 ring-billed gull

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