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There’s a cave in Kentucky that’s 426 miles long, 118 metres deep – and fish-eating spiders lurk in it
Mammoth Cave is the longest known cave system in the world – but where is it?
It spans 6000 km of the coasts of Portugal, Spain, France and Italy and houses billions of individuals – the animal that builds cities
How one super-sized ant colony could house half a billion ants
How did dinosaurs have sex with all those dangerous spikes, claws and plates? It wouldn't have been easy…
Wondering how dinosaurs mated? With difficulty, says JV Chamary.
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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
It looked like a shark, acted like one and lived 370 million years ago – before even the dinosaurs… but was it the first shark ever? The jury's still out…
Try as they might, palaeontologists have yet to agree on what the first shark actually was…
When a giant iceberg calved from the Antarctic Peninsula, it revealed a deep-sea world never seen by humans
With the help of a remotely operated vehicle, researchers went on an eight-day mission to explore the newly exposed seafloor, where they captured extraordinary footage of a host of deep-sea creatures, including a giant phantom jelly.
It’s large enough to swallow a skyscraper, wide enough to fly a jumbo jet through, and is filled with underground clouds and a river
Hang Son Đoòng is the world’s largest natural cave and remained undiscovered until 2009
Mega volcanoes, asteroid impacts and 'the great dying' – 5 deadly mass extinctions that changed life on Earth forever
What is a mass extinction – and how many of them have there been? Will Newton takes a look the 'big five' extinction events
You’ve never seen polar bears like this before: 14 captivating photos that reveal the deadly apex predator's softer side
Polar bears might rule the Arctic, but they also have a surprisingly tender side – captured here in 14 striking moments in the wild
"People risk being attacked, mauled and possibly killed…" The rise and rise of the reckless wildlife tourist
From patting penguins to selfies with bison, are people behaving increasingly foolishly around wildlife? And is education or punishment the answer?
Goldcrest or firecrest? What's the difference between these two diminutive, cute birds?
Know your goldcrests from your firecrests? Joanna Peaker from The Scottish Wildlife Trust takes a look at some of the differences…
Can you guess which animal this is in less than 12 seconds?
This is a close-up image of an animal – can you guess which one?
"Their teeth are barbed and hollow, and primed with a toxic cocktail strong enough to kill a human. Worst of all they spit out their teeth like poison darts"
You have probably never thought about whether snails and slugs have teeth, but they do...
Divers saw a shark approaching – and were stunned when it did this
Extremely rare footage shows an oceanic whitetip shark breaching in the Maldives.
Scientists tracked these elusive ‘ghost of the forest’ wild cats for over 15 years – here is what they found out
Roaming the rainforests of Sumatra and Borneo, this wild cat is extremely elusive – but scientists have finally managed a glimpse into its life.
Why do captive killer whales have drooping dorsal fins?
Orca in captivity live very different lives from those in the wild, and this can affect their physical features
It has a squidgy nose, sharp quills and a prehensile tail – and this adorable footage shows one shimmying up a tree
Have you ever seen a porcupine climb a tree?
10 sinking islands that could be lost forever…
There are thousands of islands that are threatened by rising sea levels – these are just some of those that could be lost forever
“It was pure chaos!” This diver stumbled across a huge lion's mane jellyfish in Australia
Underwater videographer shares incredible footage of the moment he discovers an enormous lion's mane jellyfish.
"While snorkelling a scientist was dragged underwater and drowned by one of these huge predators…" 8 deadliest animals in the Antarctic Ocean
If you somehow find yourself in the Antarctic Ocean, these are the animals you don't want to cross.
This solar-powered sea slug slurps its lunch like a smoothie then does a headstand. The footage is beyond belief
When these sea slugs feed on algae, they pinch their prey's ability to photosynthesise. Now, scientists have shared remarkably rare footage of them feeding.
"It requires chilly temperatures of 0 ̊C to survive. If exposed to the balmy warmth of 4.4 ̊C, their membranes dissolve and they will melt into goo"
A leftover from the last ice age, ice worms are remarkable creatures that can survive freezing temperatures says Michael Engelhard
These people went out on the reef at night – and found walking sharks in the shallows
Epaulette sharks are famous for using their fins like limbs to help them crawl around the seabed. Now, a new study reveals that coral reefs are important nursery grounds for these curious marine creatures.
"As it touches the seafloor, it kills whatever living thing it contacts by encasing it in a tomb of ice…" Discover the finger of death
Strange and deadly brinicles form polar waters because of the difference between air and sea temperatures
