Download Flash Player to view this content.

The National | Apr 17, 2012 | 2:42

Guano science

Scientists used bird droppings to determine if DDT is responsible for the decline of at least one bird species

Now Playing on CBC Radio Help Refresh

CBC Radio One

Listen Live Ottawa change

CBC Radio 2

Listen Live Eastern change

CBC Radio 3

Listen Live Radio 3
The National - Hadfield launches into spaceDec 19, 2012 | 2:49The National Hadfield launches into space Video
The National Hadfield launches into space Dec 19, 2012 | 2:49A Russian Soyuz capsule carrying Canadian astronaut Chris Hadfield lifts off from Baikonur, Kazakstan, bound for the International Space Station.
The National - Back in SpaceDec 16, 2012 | 6:03The National Back in Space Video
The National Back in Space Dec 16, 2012 | 6:03Canadian astronaut Chris Hadfield will be returning to space on Wednesday, but this time he will be doing it all in Russian.
The National - Close asteroid flybyDec 12, 2012 | 1:58The National Close asteroid flyby Video
The National Close asteroid flyby Dec 12, 2012 | 1:58CBC science correspondent Bob McDonald talks about 2 large asteroids that gave the Earth a bit of a close shave over the past 48 hours
The National - Shrinking Arctic snow packNov 5, 2012 | 2:09The National Shrinking Arctic snow pack Video
The National Shrinking Arctic snow pack Nov 5, 2012 | 2:09Canada's Arctic snow pack is disappearing even faster than experts thought, says a new study by Environment Canada researchers
The National - Lessons from the B.C. quakeOct 30, 2012 | 2:42The National Lessons from the B.C. quake Video
The National Lessons from the B.C. quake Oct 30, 2012 | 2:42CBC science correspondent Bob McDonald calls Saturday's earthquake in B.C.'s Haida Gwaii a wakeup call for people living on the West Coast
The National - Nobel medicine prize awardedOct 8, 2012 | 2:21The National Nobel medicine prize awarded Video
The National Nobel medicine prize awarded Oct 8, 2012 | 2:21British researcher John Gurdon and Shinya Yamanaka of Japan won this year's Nobel Prize in medicine for pushing the boundaries of what we know about stem cells
The National - Disappearing Arctic iceSep 20, 2012 | 5:12The National Disappearing Arctic ice Video
The National Disappearing Arctic ice Sep 20, 2012 | 5:12Scientists say they were taken by surprise by the pace of the Arctic ice melt this year
The National - Mars mission progressAug 10, 2012 | 3:53The National Mars mission progress Video
The National Mars mission progress Aug 10, 2012 | 3:53CBC science correspondent Bob McDonald talks about the progress of NASA's Mars Curiosity rover
The National - Ocean pollution spotlightAug 8, 2012 | 2:21The National Ocean pollution spotlight Video
The National Ocean pollution spotlight Aug 8, 2012 | 2:21A U.S. environmental group highlights the problem of ocean pollution
The National - Pictures from MarsAug 7, 2012 | 2:51The National Pictures from Mars Video
The National Pictures from Mars Aug 7, 2012 | 2:51NASA's Mars rover Curiosity sent its first color video images back to Earth
The National - NASA's Mars missionAug 6, 2012 | 8:03The National NASA's Mars mission Video
The National NASA's Mars mission Aug 6, 2012 | 8:03CBC science correspondent Bob McDonald talks about the significance of NASA's Mars mission
The National - NASA rover lands on MarsAug 6, 2012 | 2:53The National NASA rover lands on Mars Video
The National NASA rover lands on Mars Aug 6, 2012 | 2:53NASA celebrated the precision landing of a rover on Mars and marvelled over the mission's first photographs Monday
The National - Hi-tech car safetyJul 15, 2012 | 11:25The National Hi-tech car safety Video
The National Hi-tech car safety Jul 15, 2012 | 11:25New cars with cutting-edge technology are being designed to avoid accidents and save lives, CBC's Paul Hunter reports
The National - Seeking 'God particle'Jul 3, 2012 | 2:50The National Seeking 'God particle' Video
The National Seeking 'God particle' Jul 3, 2012 | 2:50Some Canadian scientists who have been working on an international Higgs boson project give an exclusive glimpse into their mind-bending research
The National - 'God particle' for dummiesJul 3, 2012 | 1:43The National 'God particle' for dummies Video
The National 'God particle' for dummies Jul 3, 2012 | 1:43CBC science correspondent Bob McDonald explains the excitement behind the discovery of the 'God particle'

3 of 16