On the Cover

DMNS:Bird:33881
Gyrfalcon (Falco rusticolus)

Gyrfalcons are the largest species of falcon and have a circumpolar distribution throughout the arctic. Gyrfalcons occur in a variety of color-morphs, general
categorized as white, gray (intermediate), or dark variants. This white variant specimen was collected at Cape Atholl in Greenland on September 4th, 1960.
As consummate predators, gyrfalcons prey on small-medium birds and small mammals, and have been prized birds in falconry hunting for centuries.

Photo by Rick Wicker

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"Catalyst," Issue 56. Photos and content ©2022 Denver Museum of Nature & Science, 2001 Colorado Blvd., Denver, CO 80205, unless otherwise noted • "Catalyst" is produced and published by the Denver Museum of Nature & Science for its members. • Address changes: [email protected] or 303.370.6306 (daily, 9–5) • IMAX is a registered trademark of the IMAX Corporation. • Denver Museum of Nature & Science exhibits and programs are made possible in part by the citizens of the Scientific & Cultural Facilities District. • Photography by Rick Wicker, Chris Schneider.