Dragonfly numbers 'decreasing'

Canal & River Trust ecologist Dr Mark Robinson discusses dragonfly numbers

04 April 2014

4 minutes

This clip is from

Today—04/04/2014

Science and Nature clips
Listen to a selection of clips from recent and upcoming programmes.

Pixar president: Organisations ‘prevent creativity’
Duration: 05:53

Heart surgery success linked to time of day, says study
Duration: 03:03
Hello Smart Glasses, goodbye VR headsets?
Duration: 03:43
Today's Babies: Meet the families
Duration: 13:31
Today guest editors: Theresa May
Duration: 01:46:02