Scotland's Western Isles

Neil Oliver searches for sea eagles, recently reintroduced to the island of Canna.

Kate Rew is hunting for the marvellously titled bone-eating snot flower, a mysterious creature that lives on whale skeletons.

Alice Roberts visits Skye to explore what remains of a remarkable industry which grew up 200 years ago to extract chemicals from seaweed for glass manufacture. Alice investigates the desperate living and working conditions for the locals who harvested the kelp.

Nick Crane stretches credibility to the limits as he sets out to discover the true length of Britain's coastline. He discovers that the answer is infinitely absorbing as he stumbles across a brain-expanding branch of mathematics that revels in the twists and turns of nature. It turns out it's because of this fractal maths that we are able to make our mobile phones so small.