In this episode of The Debrief, we catch up with environmental scientist João Costa, a researcher at the Narew National Park in north-eastern Poland.

The Narew National Park is home to one of Europe’s few braided rivers, which provides a home to wetland flora and fauna, and – needless to say – is an area of extreme beauty.

How did this 40-something Portuguese academic get involved with the local fauna? John Beauchamp went up to the park’s headquarters up in Kurowo to find out.