Dr Phil Wilkins is a palliative care consultant, but his overwhelming passion is insects. Mary Colwell explores the connections between being a doctor and an entomologist. Show more

Water voles are famous for being Ratty in Wind in the Willows, but they are disappearing fast from our waterways. Mary Colwell meets water vole warrior Darren Tansley. Show more

Mary Colwell meets Simon Bosenquet who advocates the beauty and the importance of mosses and liverworts. Simon believes people ignore these tiny green plants at their peril. Show more

Grey seals are Britain's largest mammal, but remain a mystery. Mary Colwell meets Sue Sayer on a windy cliff in Cornwall to view the animals Sue loves so much. Show more

Forty years of being a bear guide have convinced Derek Stonorov that grizzly bears are nothing like the fearsome creatures we are led to believe. Show more

Grant visits Daniel Schindler and his wife Laura Payne, who spend their summers with their five-year-old daughter studying the spawning grounds of the world's last great salmon run. Show more

Gabrielle Walker visits Madagascar to meet Patricia Wright, one of the world's leading experts on lemurs. She talks about the thrill of discovering an entire new species.

Grant Sonnex talks to Pete Abraham, a Yupik Eskimo who grew up in a tiny settlement with pet seagulls, seals and otters. Show more

Writer and naturalist Paul Evans meets Prof Lynn Margulis, whose study of the Earth's smallest creatures led to a revolutionary theory for all life on Earth. Show more

Writer and naturalist Paul Evans goes to Maine to meet David Evers, a conservation biologist who has spent a life with loons, the enigmatic bird of northern lakes. Show more

Writer and naturalist Paul Evans goes to the Highlands of Scotland to meet Roy Dennis OBE, statesman of British conservation, who has spent a life with ospreys. Show more

Julian Hector visits New York to meet fruit fly expert Max Levitan, whose long-term studies reveal indicators of how a species can adapt to changes in climate conditions.

Gabrielle Walker meets Ola Johannesson, who has spent a life working with and living on the Arctic sea ice. He is a disciple of the Norwegian scientist and explorer Fridtjof Nansen.

Mary Colwell meets Keith Hiscock, who has spent his life learning about coral around the UK, inspired by retracing the steps of Victorian naturalist Philip Henry Gosse. Show more