Birds are the most accomplished aeronauts the world has ever seen. They fly high and low, at great speed, and very slowly. And always with extraordin… - David Attenborough

The battle between cuckoos and other birds is a continuing one. The cuckoos developing new stratagems and perhaps finding new victims, and the victims finding new defences.

As I see it humanity needs to reduce its impact on the Earth urgently and there are three ways to achieve this: we can stop consuming so many resources, we can change our technology and we can reduce our population. We probably need to do all three. m31m37-m31s56

Our imprint is now truly global. Our impact now truly profound. Our blind assault on the planet has finally come to alter the very fundamentals of the living world.