Fish
It has no scales, swims upright and grips with its tail – so why is the seahorse considered a fish?
Its upright posture, rigid body and bony armour make it look more like an insect than a fish – so what actually IS a seahorse? And what defines a true fish?
It's bigger than a king-size bed and is as flat as pancake: Meet the deadly ambush predator lying in wait on the ocean floor
Our guide to the strange looking angelshark, once common in British waters.
Reef rockstars: Meet the fish that disguise themselves as rocks to ambush their prey – with deadly consequences
Nature is full of oddballs – including these peculiar-looking fish that have adapted to their environments
Cute and very shy yellow boxfish filmed pootling around a reef – and it has a friend
An underwater photographer was surprised to see the two timid creatures hanging out calmly together.
Meet nature's strangest strollers: The fish who use fins as feet to 'walk' on land
From the mountains of Venezuela to the mudflats of Japan, across the globe these amazing fish have evolved to walk across dry land
10 amazing Antarctic animals – including one with antifreeze blood and another with razor-sharp teeth to bite air holes in the ice
Discover the most remarkable, captivating wildlife that thrives in one of the least hospitable places on Earth – Antarctica
“We have an inherent fascination for apex predators”: Steve Backshall on why we need to rethink sharks – and how social media could help save them
Steve Backshall on why we need to stop thinking of sharks as creatures to fear, and why Steven Spielberg's Jaws has got a lot to answer for
Meet nature’s deadliest sniper, the archerfish – this lethal assassin shoots down prey with fatally accurate water jets
10 deadliest fish on the planet: you won't want to meet these fearsome species underwater
Beyond the shark! We bring you a veritable who's who of the scariest fish species lurking in the deep (and not-so-deep) waters.
These are the rarest sharks in the world – and before long they could be extinct, warn Shark Trust
Uncover the mysteries of the ocean's most elusive predators with our roundup of the world's rarest species of sharks and rays
This mythical looking creature drifts through the ocean disguised as seaweed – meet the curious ‘seadragon’
It also swallows its prey whole and has an unusual mating ritual.
Nemo is shrinking: climate change is causing Disney's favourite fish to get skinnier and shorter
Clownfish, made famous by the movie Finding Nemo, shrink to survive heat stress and avoid social conflict during marine heatwaves, a new study finds.
Most beautiful fish: Are these 8 species are the ocean's most stunning fish?
From dazzling colours to intricate patterns and graceful shapes, these spectacular fish showcase the incredible beauty thriving in our oceans
Are there great white sharks in New Zealand waters?
The country is a haven for wildlife with many of its own endemic species – but can great white sharks be found there?
The weirdest sharks on the planet, including one that can walk: Discover some of the ocean's strangest creatures
Celebrate the wonder and variety of these ancient, much-misunderstood fish in our list of the weirdest sharks in our oceans
Can any animals kill a great white shark?
Great white sharks are an epic predator but other animals can harm them to
“It’s hard to imagine a more wasteful way to catch fish” David Attenborough narrates never-before-seen footage of destructive bottom trawlers
The widespread fishing practise has been filmed for the first time in such detail as part of a new Attenborough-narrated documentary.
We don’t know how great white sharks have sex, but what we do know about their mating ritual is terrifying
All we know about great white shark sex
It's longer than a bed, covered in slime and has teeth in its throat – meet this giant hunter of the reef
This 30-kilogram predator hunts mostly at night, ambushing prey before swallowing it whole with its specially adapted jaws.
Incredible shark facts: 34 hard-to-believe facts that celebrate this fascinating, yet much-maligned fish
Celebrate the wonder and variety of sharks, an ancient and much-misunderstood fish.
How deadly are sharks to humans?
People often worry about the risk of shark bites but how dangerous are these predators to humans in reality?
Are there great white sharks in UK waters?
British seas have temperate waters and lots of seals – perfect conditions for great white sharks. But is the iconic species found here?
David Attenborough narrates amazing BBC underwater footage of the fastest fish in the sea using their 'swords' to 'disarm' their prey
Giant predatory sailfish use their swords to 'disarm' their fish prey rather than to dismember them.
The incredible fish that scale 120 metre high waterfall rock faces with an astonishing climbing technique – watch amazing video to see how they do it
Did you know fish can climb? Meet the amazing waterfall-climbing goby