Charles Darwin is an international celebrity, but Gregor Mendel holds the key to heredity.
A mysterious discovery prompts Anna Pavord to celebrate her botanical hero William Turner.
Travel writer Redmond O'Hanlon proposes the pioneering naturalist Alfred Russel Wallace.
George Beccaloni chooses naturalist Alfred Russel Wallace as his Natural History Hero.
Brian Cox and Robin Ince mark the 100th anniversary of the death of Alfred Russel Wallace.
Melvyn Bragg and his guests discuss the work of the biologist Alfred Russel Wallace.
Travel writer Redmond O'Hanlon champions the life of naturalist Alfred Russel Wallace.
Bill Bailey and his love for Victorian naturalist Alfred Russel Wallace
Brett Westwood shares his audio-diary of the natural world in summer.
Brett Westwood reflects on wildlife changes in his local patch over 40 years.
Businessman and academic, Adair Turner looks at the life of Charles Darwin.
Businessman and academic Adair Turner talks about the life of Charles Darwin.
Nature broadcaster Chris Packham goes back to 1662 to witness the extinction of the dodo.
Chris Packham, host of BBC Springwatch, selects favourite episodes from Tweet of the Day.
Melvyn visits Darwin's home at Down House in Kent.
Darwin's early life in Shropshire and his three years at Cambridge.
How Charles Darwin used the plants in his garden to develop his theory of evolution.
Paul Nurse discusses scientist, inventor and poet Erasmus Darwin, grandfather of Charles.
Former England player Graeme le Saux champions the life of conservationist Gerald Durrell.
Michael Berkeley’s guest is writer Helen Macdonald.
Scientist Lord Robert May nominates the naturalist and botanist, Joseph Banks.
How plants proved a new route to political power and the growth of Britain's Empire.
Clare Balding walks with naturalist, author and TV presenter Steve Backshall.
Steve Backshall talks to extreme adventurer Ed Stafford.
Steve Backshall and Helen Glover walk with Clare Balding on Winter Hill in Berkshire.
Steve Backshall speaks to professional rock climber Leo Houlding.
Why did Darwin lose his faith?