They swim, they eat, they multiply.
Some animals, such as ghost shrimps can even cope with water that is saltier than normal seawater. It's all down to evolution.
Californians love their coast and strongly oppose offshore drilling. Will they support converting old oil rigs to artificial reefs – a policy that benefits both marine life and oil companies?
Phytoplankton are tiny, but they do important work.
Molluscs that have shells - like pipis, clams and oysters - have to build their own shell from scratch. And they keep building it their whole life, using chemicals from the sea and their own bodies.
Pumping very salty water into the ocean has surprisingly little impact on marine life.
Confrontation between French and British scallop fishers goes is a warning about the resource conflicts of the future.
Plastic bags are commonly mistaken for food by sea animals. They require a lot of energy and resources to be made, and have caused floods in some countries.
Why do whale sharks come together at just 20 locations around the globe?
Marine heatwaves have had little attention until recently, but they're already having large effects.
The wrecks of the German WWI fleet are home to an abundance of biodiverse marine life, now under threat from climate change.
Scientists have discovered a natural sunscreen – made by microbes – that may be better for humans and the marine critters they are hoping to see.
Biologists are finding new evidence that these ocean invertebrate grazers don't just ingest whatever they catch. They can actually be picky eaters – and their choices might influence ocean food webs.
The noise from motor boats, sonar and other industrial activity interferes with the underwater chatter of fishes.
Artificial islands that are now mushrooming across the ocean are regarded as 'engineering marvels'. But, little attention is paid to how these human-made structures affect sea life.
Extreme weather led to starfish mass strandings along beaches in Kent and East Yorkshire.
From the oil that makes your petrol, to car parts, to the groceries and other things in your weekly shop, retail consumerism is driving a boom in the amount of noise in the world's oceans.
Scientific fieldwork that happens underground and underwater in spectacular but dangerous caves opens a window on a largely unknown world.
The world's oceans are home to innumerable life forms, from sponges to sea lions, and scientists have many creative ways of studying them.
Surveying the bottom of the ocean turns out to be far from easy. But there was something wonderful about seeing animals we have only read about in old books.