PlanetEarth Online

Owls in trouble in a changing world

Tawny owls are threatened with long-term decline because environmental change is dampening the population cycles of their favoured prey, a new study has shown. If the situation continues, the owls will slowly ...

Mar 17, 2014
3 / 5 (2) 0

Big sperm don't always win the race

When females mate with more than one male, each one's sperm has to compete to get to her eggs. Until now, researchers had thought the fastest sperm would dominate.

Jan 31, 2014
4.6 / 5 (5) 0 | with audio podcast