Much of Mark’s life work has been exploring issues of conservation and biodiversity, such as his efforts in Brazil’s endangered Atlantic Coastal Forest (where he photographed this endless pile of lumber).

National Geographic Magazine has reported on the species that have been named after Mark, such as a frog he collected a quarter mile deep in a Venezuelan sinkhole, a beetle from 14,000 feet in the Peruvian Andes, and an ant from the French Guiana rainforest. Since then Mark have found more species, plus has had a fictional plant was named after him by Amy Tan in her 2005 bestseller, Saving Fish from Drowning.

His main concern is in documenting underappreciated small creatures, and even here he focuses on several favorite themes. One is the importance of pollinators, documented in the videos below.

This National Geographic television video shows Mark tracking down the tiny fly that pollinates cacao flowers, and thereby gives us chocolate.

Mark produced this video, describing a number of unusual pollinating animals, for the international photography festival LOOK3.