1Animal Frankensteins
Hybrids can be bizarre and they can be deadly. We look at two hybrid animals that owe their existence to human interference – the pizzly bear (a cross between a polar bear and grizzly), which has come into being because of global warming, and the killer bee brought into existence because of the transfer of African bees to South America.
2Finding the Way
Some animals have an extraordinary ability to find their way. The dung beetle, an insect revered by ancient Egyptians, uses the sun, the moon and even the Milky Way to move its prized ball of dung in the right direction. Pigeons are often considered feeble birdbrains, but they have incredible memories that can recall several complex travel routes with amazing accuracy and they even use manmade roads and hedgerows to find the quickest way home.
3Des bébés de taille étrange - Pandas géants et kiwis
Le panda géant donne naissance au plus petit bébé de tous les mammifères et doit en prendre soin et le protéger pendant de nombreux mois. Le kiwi pond l'un des plus gros œufs du monde des oiseaux, qui produit un poussin très bien développé. Pourquoi les pandas ne donnent-ils pas naissance à des petits plus développés et plus robustes et pourquoi les kiwis produisent-ils un seul œuf qui représente le quart de sa masse corporelle et qui est presque trop gros pour être pondu ?
4Curious Counters
Can animals count? This is a question that has intrigued and fooled investigators for a long time. Just over a hundred years ago, a German horse called Hans was declared a mathematical genius but all was not as it seemed. And strangely, some bamboos around the world flower exactly at the same no matter where they are – are they counting down the years?
5Incredible Shells
David Attenborough investigates two shells that have proved to be winners in evolution: the bird’s shell and the hard shell of the tortoise. The ostrich egg is so strong it’s possible for a person to stand on it without it breaking – how does the chick break out of this fortress? The evolution of the tortoise shell was for a long time a mystery and this bony box offers a lot more than just protection.
6Ferocious Fighters
The Siamese Fighting Fish is so aggressive it will fight its own reflection until it is exhausted. Recent research shows that the fighting behaviour varies and depends on the personality of the fish! Male kangaroos were once pitted against humans in the boxing ring – the most impressive male kangaroos are solid blocks of muscle with a kick that can kill. Why do they fight and what skills must a winner have?