Beavers are native to Scotland, but for many years were extinct here - until now.
Join a group of children as they find out all about this famous fish and its lifecycle.
Find out about Scotland's red squirrels and how they are being protected.
Why do we live with cats and dogs?
BBC World Service
5/5 Alison Steadman tells the story of how and why the starling is hated in North America.
BBC Radio 4
4/5 Alison Steadman tells how a parakeet became a British bird.
3/5 Alison Steadman asks how it should be decided what makes a British bird.
2/5 Alison Steadman tells how the Canada goose and ruddy duck became British birds.
1/5 Alison Steadman tells the story of how and why the pheasant became a British bird.
Roland Buerk reports on Japan's doggy obsession and the demographic time-bomb behind it.