PAUL MEEHL IMAGES 612 597 1908 [Into the Field We Go]

When a cactus wren is pulled out of a mist net, a genetic sample is also taken. The date from the genetic samples is shared with the U.S. Geological Survey (USGS) so that both groups can learn more about the cactus wren. If you look closely at the leg you can see red and yellow bands, which are used to visually identify the birds.