Fish
Its 4 to 6 fang-like front teeth deliver the most severe damage – and its snapping jaw reflex can even be triggered after death
Here's why the wolf-fish is named after a canine
"Even craftier males masquerade as an unreceptive female. Brazenly strolling past the dominant male, they boldly service the female in front of her betrothed."
When it comes to mating season, these tentacled giants know how to put on a show
"When threatened it slips into a crevice and inflates its body like a rubber raft. Within seconds, it's twice its original size and wedged in place."
How and why the swell shark can inflate itself to twice its size
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Are rays just flattened sharks? No, say the experts at The Shark Trust, there's a bit more to it than that
Uncover the similarities and differences that set sharks and rays apart.
"A fish the size of a dining table and as heavy as a grizzly bear, yet reports of specimens twice that size exist..." 10 largest river fish on the planet
Rivers and lakes don't seem like the perfect habitat for very large fish – but you'd be surprised...
It has human-like, sharp chisel teeth and a powerful bite. Divers are advised to swim away, as making for the surface only encourages an attack…
Here's everything you need to know about the titan triggerfish
‘Lost’ animal caught in fishing net in Papua New Guinea. It hasn't been seen by scientists for more than 40 years
Missing from scientific records for four decades, the spinach pipefish has been 'rediscovered' thanks to local communities – who knew of its whereabouts all along.
Scientists dosed aggressive fish with hallucinogenic drugs – and discovered something interesting
The psychoactive compound in ‘magic mushrooms’ may reduce aggressive behaviour in a species of fish
“Once they descend into the cave, they trudge 150m in the pitch black, feeling around with their trunks.” 9 weird animals found in caves
What lurks in the dark depths of caves might send shivers down your spine…
It can be as long as a cricket pitch, weighs a mighty 30 tonnes (that's three-times the weight of a T-rex) and can live for a century
The whale shark is the world's largest shark and fish species, with a maximum age estimated to be 100 years and it's thought they can reach up to 20 metres in length.
It’s 3 metres long, shaped like a scythe and used to whip and stun prey – this is the longest tail on the planet
While you might think that the record holder for the world's largest tail could belong to a whale, that's not technically true
Pound for pound, this little fish has the most savage, brutal bite ever measured – way stronger than a great white shark
It might be small but it sure is mighty...
It has a rather grotesque face, electric organs, venomous spines and can swallow prey whole thanks to its huge mouth, which can suck them right in
These ambush predators can also create a vacuum that sucks prey right into their mouths.
"Buried on ocean’s floor lies a flat, pancake-like lethal predator that's bigger than a king-sized bed and perfectly designed for deadly, ambush attacks"
Our guide to the strange looking angelshark, once common in British waters.
"The heavens opened – and it started raining fish, hundreds of them…" And the possible reason was even more bizarre
Here are the possibilities investigators considered to explain the crazy experience
It's longer than a shipping container, has a metre-wide mouth and a dorsal fin the length of a baseball bat: 9 biggest, most gigantic sharks on the planet
These are some of the largest sharks in the sea (and the biggest isn’t the great white!)
It uses its razor-sharp saw-like teeth as a cookie cutter to rip circular chunks of flesh from its prey
Researchers looked inside an Indian well – and found a colourless creature hidden in the darkness
A new species of subterranean earthworm eel has been found living beneath the ground in the Indian state of Bihar.
"A sting from one of these deadly creatures can kill a human in a matter of hours…" 10 most dangerous, deadliest animals in the Indian Ocean
From tiny stinging jellies to huge predatory sharks, these are some of the most dangerous animals in the Indian Ocean
“I had to do a double take." Marine biologists peered into a shark egg and were astounded by what they saw
In spring 2025, researchers documented the first confirmed case of identical twins in small spotted catsharks.
It weighs the same as a gorilla, can reach 3m long and has a huge mouth packed with rasping teeth – and it’s been biting swimmers
The 3 metre freshwater fish wreaking havoc in Spanish rivers
"Its sting can cause vomiting and existential dread, and can kill within five minutes..." 10 most dangerous, deadliest animals in the Pacific ocean
From cone snails to crocs, be wary of these deadly marine animals – all found in the Pacific Ocean
Does this 25kg fish deliberately go after a man’s testicles? The 'nut-crusher' that mimics the ferocious piranha
It is no coincidence that the red-bellied pacu bears a strong similarity to the red-bellied piranha (Pygocentrus nattereri), especially as juveniles.
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?
