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

1213 blue jay

1214 carolina wren

1215 Northern mockingbird

1216 pine siskin

1217 ruby-throated hummingbird

1218 white-winged crossbill

From the Library of Natural Sounds, Cornell Laboratory of Ornithology.

Try the lab's website: www.birds.cornell.edu.