Play the video above to see these stories on AZ Illustrated Nature for Wednesday, May 1:

BIOBLITZ 2013 is an intensive effort by scientists and volunteers from the Sky Islands Alliance to discover, count, map and learn about organisms, from the microscopic to the large, in the Patagonia region. Tony Paniagua reports from the scene, and Georgia Davis interviews two scientists who participated.

ANIMAL MARKINGS are used by wildlife officials to keep track of critters in the wild. Take the Mexican gray wolf, for example. Dozens have been released into their ancestral habitats in Arizona and New Mexico, and scientists are following them, literally and figuratively. Producer Tom Kleespie shows how.

INTERNATIONAL MIGRATORY BIRD DAY is coming up, and with Southern Arizona being one of the Western Hemisphere's birding hot spots, we speak with the executive director of the Tucson Audubon Society, about the day's events. Georgia Davis interviews Paul Green.

THE DESERT IN MAY is a splendor. Just before summer's big heat sets in, cacti are blooming and the first young creatures of the year are emerging. Producer Tom Kleespie takes a look at natural occurrences expected in the Sonoran Desert for the month.