In 1982 a husband and wife began recording mammals along fixed trails on an island in the Panama Canal, later adding a line of camera traps, and they kept it up for 44 years. This year they began handing the project to a younger researcher who wants it to reach 100 years.

In 1982 a husband and wife began recording mammals along fixed trails on an island in the Panama Canal, later adding a line of camera traps, and they kept it up for 44 years. This year they began handing the project to a younger researcher who wants it to reach 100 years.

A half-century of mammal counts on a Panama Canal island is about to become a century-long experiment in ecological change—if the handoff works.