Wildlife cameraman Doug Allan recalls his encounter with snowy sheathbills in Antarctica.
Doug Allan on the Snowy Sheathbill
Dave Gorman and guest Matthew Wright chew over ridiculous and unworkable inventions.
Adam Walton travels across North Wales in search of snakes.
Late actor Esmond Knight loves the forlorn sounds of nature including some heard in India.
Tax on Connectivity in Africa
Online access down as some African countries impose connectivity tax
Plastic pollution with Richard Thompson
How Richard Thompson alerted the world to the micro-plastics in the ocean.