Fish
It weighs the same as 2 grizzly bears and can be aged like a tree – meet the ocean giant that hurtles through the ocean at 44 miles per hour
Bluefin tuna are impressive fish – the largest on record was a 679 kg bluefin caught off the coast of Canada in 1979. But did you know these big beasts start off at just the size of an eyelash?
"It's bigger than a full-size snooker table and has a 40cm-long stinging spine."10 most fearsome, deadly river monsters, including a grisly giant leech
Freshwater holds fewer deadly surprises than the sea - rivers, lakes and streams are places of peaceful serenity. Or are they...?
It's the size of a double-decker bus and weighs a mighty 7 tonnes. Meet the ocean giant that cruises - through the oceans
Basking sharks are the second largest shark species in the world. They feed on microscopic animals called zooplankton.
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It has a built-in suction cup, vampire-like fangs, can swallow its prey whole – and has one very disgusting dining habit
Rocksuckers can swallow limpets whole before later regurgitating the shell
"Torpedo-shaped bodies, pointed snout and a jutting lower jaw packed with fearsome, sharp teeth – it has been known to attack swimmers…"
All you ever needed to know about the barracuda
The monstrous, snake-like huge 8m long serpent fish that are known as “harbingers of doom”
Meet the mysterious oarfish, the deep swelling sea serpent that's known as harbingers of doom”.
It looks like something from another planet, eats with a beak and spits out every bite – and has teeth in its throat… nature doesn't get much stranger
Sunfish can grow more than three metres long and weigh almost 3,000 kilos
It grows to 2m and weighs 200kg… but its greatest weapon devastated an entire ecosystem
The sacred fish that has collapsed an ecosystem
They contain a quarter of all freshwater on Earth – but home to hundreds of ocean-like creatures
The sprawling African Great Lakes support a high number of endemic species
You've seen the horror films but can piranhas ACTUALLY kill a human?
Could piranhas actually kill a human? Stuart Blackman takes a look at the evidence?
“Apparently, if you go to the toilet in this river, it will swim up the stream of urine right inside you – and launch using two backward-facing spines.”
We always think of the ocean’s dark depths as the habitat housing the most nightmare-inducing and impressive creatures – but rivers can too…
The shark that can walk in and out of water…
There are a few species of 'walking' fish, but did you know there was a walking shark? Read on...
It's as long as a stretched limo and swings its lethal chainsaw snout from side to side to slice its prey in half
Largetooth sawfish are one of the most unusual-looking creatures in the sea but their iconic snout also puts them at risk from humans
Watching a shark hunt prey was amazing enough – but then it plunged its nose into the reef… What was it after?
Why is the blobfish so ugly? The bizarre truth behind the 'world’s ugliest animal'
We take a look at why the unfortunate blobfish has been labelled as the ugliest fish in the world
"I could hardly believe what I was seeing. Suddenly out of nowhere the massive school of fish parted and a great white emerged from underneath…"
Majestic great white shark swims amongst a massive school of Australian salmon in Jervis Bay on the NSW South Coast of Australia.
It can be as long as a double decker bus, move as fast as 24kmph and as graceful as a dancer…
Learn about the largest rays in the world with our essential guide to manta rays, including how to identify, how manta rays feed and where they live in the wild.
Watch this sarcastic fringehead use its enormous mouth to protect its territory – it gets heated...
Sarcastic fringeheads are small, but what they lack in size they make up for in ferocity.
Canals were built for industry, but have become a lifeline for endangered species. Here’s why
Britain’s canals were not designed for nature, but for many species they could be what makes survival possible
“Inside every female, there is a new male in waiting...” This bizarre-looking fish attempts to mate – but there’s one big problem
This female kobudai vanished after refusing a mate. When she resurfaced, everything about her had changed.
"With a single bite, prey can be incapacitated or sliced in half, by fearsome, razor-sharp teeth the same size as a great white's…"
Meet the fearsomely fanged, freshwater monster with a bite like a crocodile
"The fangs are huge, too large for it to close its mouth. Instead, they act as a cage, trapping would-be prey as though on Death Row"
The mega-mouthed fish that can turn on the lights and catch prey in a cage
This weird fish has a hedge-trimmer for a face. Scientists have just discovered something shocking about it
Scientists assessed how vulnerable sharks and rays around the world are to climate threats and the largetooth sawfish came out top
"A single, accidental step can trigger intense, burning pain, inflammation and nausea that can last for hours. In rare cases, it can cause death."
Sometimes it's not a good idea to walk barefoot across a beach...
