Catalina Trail (née Aguado, previously known as Cathy Brugger) is a Mexican-born naturalist and social worker.
She is noted for discovering, with her then-husband Kenneth C. Brugger, the location of the overwintering sites of the monarch butterfly, Danaus plexippus.
When she was 11 she moved with her family to the state capital, Morelia, and by age 17 she was living and working in Mexico City.
She loved adventure, exploring Mexico, Canada, the United States and Central America alone or with friends.
[2] In 1972 Brugger showed her a notice in a local newspaper written by Fred and Norah Urquhart, Canadian entomologists who had been studying the migration patterns of monarch butterflies since 1937.
Finally on January 2, 1975, they found a summit called Cerro Pelón where the trees and even the ground were covered with millions of resting butterflies.