Animals

Sunday, 20 September 2026
15 facts about fleas
15 facts about fleas
External parasites
Fleas are one of the most hated insects by pet owners. Once they find their way onto a dog or a cat, they are very hard to remove. Reproducing at a ve ...

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Clownfish
All clownfish are born males.
They can become a female in adulthood. It happens for example if a dominant female is killed.
Okapi
The first okapi was born in captivity in 1919 in the zoo of Antwerp.
Goblin shark
Despite their rarity, goblin sharks are not endangered.
IUCN classifies those fish as a least concern (LC). Because they are bottom-dwelling creatures, the ...
Malaysian trumpet snail
The red-rimmed melania can transfer parasites dangerous to humans.
It hosts parasitic lungworms, such as the Chinese liver fluke and the oriental lung fluke, that can cause clonorchiasis and paragonimiasis.
Bird of Paradise
Fortunately, most birds of paradise are not threatened with extinction.
Only three species are threatened with extinction. Birds of paradise were protected quite early.  Th ...
Octopus
Octopuses of the species Amphioctopus marginatus collect coconut shells and use them to build their hiding places.
Axolotl
It is closely related to the tiger salamander, an amphibian native to North America.
Unlike its cousin, however, the axolotl, lacking thyroid-stimulating hormone, never leaves the aquat ...
Northern pike
They are mostly active during the day.
A characteristic feature of these fishes is the long time they spend each day foraging and a very fast metabolism. This explains why they can grow so fast when given enough food.
Portuguese man-of-war
They are commonly confused with jellyfish, thanks to their tentacles.
Crustacean
The first crustaceans appeared on Earth in the Middle Cambrian more than 500 million years ago.
Crabs and shrimps did not appear until the Jurassic (201 - 145 million years ago) and lobsters appeared in the Cretaceous (145 - 66 million years ago).