Sir David Attenborough is back with another television and book twofer, this time exploring the ocean. Packed with stories ...

Blue whales and killer whales (orcas) are some of the largest creatures in the ocean and some of the most famous. These intelligent animals are truly amazing and share some distinct similarities.

From the enormous blue whale to the delicate monarch butterfly, animals of all shapes and sizes migrate across the globe.

Hundreds of thousands of Velella velella, more commonly known as by-the-wind-sailors, are drifting onto the coastline.