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John Iverson's mark-recapture studies of the natural populations of the Allen Cays Rock Iguana in the Exuma Islands, Bahamas -- conducted since 1980 -- represent the longest ongoing field study of any lizard population in the world. This work has been undertaken with the help of almost 100 Earlham students and continues annually.

• John Iverson/“John Iguana." 30-Year Effort Pays Off for EC Biology Professor
  (Press Release January 2004)
• Results of Allen Cays Iguana study (Cyclura cychlura inornata)
  

Bahamas Iguana Research

Seven month old iguana

Nebraska Turtle Research

Since 1980, John Iverson has employed mark-recapture and radiotelemetry studies to describe the ecology of the turtles and snakes of the Crescent Lake National Wildlife Refuge in the Sandhills of western Nebraska. Annually, students help with this research.

• Reproductive and Overwintering Ecology of Hatchling Painted Turtles (Research Report)