Fish
10 animals that have been to space
Animals were the early pioneers of space flight, taking one giant leap into space, and often losing their lives in the process. But what animals have been in space, and how many animals have died in space?
What are myotomes?
Where are myotomes in a fish and how do they help it to swim?
What is the world's largest freshwater fish?
Once belonging to the Mekong giant catfish, the title of the world’s largest freshwater fish was awarded to another Mekong-dwelling species in June 2022.
The origin of pieces: 18 amazing ways animals and plants have evolved
Discover the origin and purpose of the structures of living things, from why baboons have swollen bottoms to the comically-large paws of moles.
The sex-changing fish from Finding Nemo
Clownfish – the stars of the children's film Finding Nemo – switch sex to complement that of their new partner, as broadcaster, zoologist and author Lucy Cooke explains.
Basking shark guide: how big they are, what they eat, and why they're endangered
Basking sharks are the second largest shark species in the world, and the largest found in UK waters. They feed on microscopic animals called zooplankton.
Why didn't more of our fishy ancestors come ashore?
Study suggests adapting to life on land wasn't the biggest challenge facing fish coming ashore millions of years ago.