Superstition or wishful thinking could trick you into thinking you saw one of these mythical creatures.
AP Photo/Eduardo Munoz Alvarez
Mermaids are not real, but are meaningful to people around the world.
Jaime Bran/Museum of New Zealand Te Papa Tongarewa
This newly discovered ancient monk seal is challenging previous theories about how and where monachine seals evolved. It's the biggest breakthrough in seal evolution research in about 70 years.
Researchers are looking into why around 5,000 Cape fur seals were found dead on Namibia's coast.
Artwork by Peter Trusler
Our new research has more than doubled the known fossil record of seals in Australia.
King Penguins at sea.
This study provides the first evidence that penguins emit sounds underwater when they hunt.
Clapping underwater takes real strength. But wild grey seals can do it, to warn off competitors and attract potential mates.
Diving animals are incredible athletes.
A pod of narwhals (
Monodon monoceros) in central Baffin Bay. Narwhals are the most vulnerable animals to increased ship traffic in the Arctic Ocean.
Kristin Laidre/University of Washington
Climate change is shrinking Arctic sea ice and opening the region to ship traffic. Whales, seals and other marine mammals could be at risk unless nations adopt rules to protect them.
Animals in the western Arctic have higher levels of mercury in their bodies than those in the eastern Arctic.
A new study demystifies regional differences in mercury levels in marine animals in the Canadian Arctic.
Wild grey seal eating a large Atlantic salmon after first peeling back the skin using its teeth and claws.
Northern seals use strong claws to tear apart large prey and this gives us clues about how the earliest seals likely behaved when they first began feeding in water.
A white shark attacks a seal.
Dave van Beuningen
If sharks habitats aren't known, it's harder to conserve either the animals or those habitats.
A baleen whale feeding in the Hauraki Gulf, New Zealand.
Dr Krista Hupman
There are plenty of mammals that have adapted to life in water, some more than others. That meant they also had to adapt the way they feed.
No deep voices here.
Size doesn't always matter when it comes to the pitch of your voice, especially if you're an aquatic mammal.
A blue whale surfaces.
Songs of marine animals can help us discover new populations.
Black rhino cow and calf, southern Africa.
Next time you plan a holiday you can rest assured that wildlife sightseeing can help some threatened species.
The Thames whale: a rather lost northern bottlenose.
It didn't turn out well for the whale who went to Westminster, but others have made a happy home in British waters.
There is an abundance of baby fur seals on the west coast of South Africa, but true seals, which inhabited the area five million years ago, no longer do so.
Climate and sea level changes over time have led to the disappearance of the true seals, although these mammals still exist in the Antarctic.
But I didn’t do it on porpoise, your honour.
It’s one of the big mysteries in my career as a marine biologist. Something lurking in the seas off Britain has been chomping away at local porpoises and none of the usual suspects fit the bill. Now scientists…
Best served chilled: Antarctic krill (Euphausia superba)
Although it is far from the power stations, roads and flight paths of the populated world, the Southern Ocean is already responding to climate change. Average sea temperatures in some parts have risen…
On thin ice?
Alan D. Wilson/naturespicsonline.com
Foundation essay: This article on the future of the Arctic by Tavis Potts, Senior Lecturer in Oceans Governance at the Scottish Association for Marine Science, is part of a series marking the launch of…