Humpback whale

© Philip Thurston/Getty Image

Where the humpback whale sings. World Oceans Day

Oceans cover more than 70% of the Earth's surface, so it's no surprise they play a crucial role in our planet's climate and ecosystem, supporting a huge amount of marine life. Humpback whales, like the one in our homepage image, can be found in all oceans and have among the world’s longest migrations, traveling thousands of miles from tropical breeding grounds to colder waters in search of food. They are also known for their haunting 'songs.' There are many theories about why they sing, but some research suggests it might be a sign of loneliness. The good news is, that a global ban on commercial whaling has seen their numbers increase, so there is less need for whales to feel lonely.

However, whales' aquatic environment is still at risk from climate change and human action. World Oceans Day is held on June 8 to remind us that the oceans are crucial for the survival of all life on Earth, producing at least half of all the planet's oxygen and home to most of its biodiversity, upon which we all depend.