What began as a childhood hobby more than six decades ago has led to what might be Africa’s largest butterfly collection in a suburb of Kenya’s capital.

During his 20-year career as an agronomist, Collins dedicated his free time to research. He established the African Butterfly Research Institute in 1997.

Now, running out of space and time, he hopes to hand it over to the next generation.

On his 1.5 acres (0.6 hectare) of land, hundreds of indigenous trees and flowering bushes form a well-knit forest. Hundreds of butterflies dance from one flower to another, at times landing on Collins’ hand.