For recordings of bird songs, call 612-673-7800, and when prompted press the following four-digit numbers:
1231 American crow
1232 black-billed magpie
1233 common raven
1236 purple martin
1235 red-eyed vireo
Recordings from the Library of Natural Sounds, Cornell Laboratory of Ornithology. Try the lab's website: www.birds.cornell.edu.
