Most fish have little salt in them. Sharks, however, have meat as salty as the ocean they live in.
Saltwater fish need to drink more water than freshwater fish. Since seawater is saltier than the liquids in a fish’s body, water inside the fish is constantly flowing out. If they didn’t drink to replace the lost water, saltwater fish would dry up like prunes
Most fish cannot swim backwards. Those that can are mainly members of one of the eel families.
A fish does not add new scales as it grows, but the scales it has increase in size. In this way, growth rings are formed and the rings reveal the age of a fish.
Most fish have taste buds all over their body.
Sharks are the only fish that have eyelids.
Seahorses are the only fish that swim upright.
Most brands of lipstick contain fish scales.
Many languages in Africa include a “click” sound that is pronounced at the same time as other sounds. You must learn these languages in childhood to do it properly.
More than 1,000 different languages are spoken on the continent of Africa
Somalia is the only African country in which the entire population speaks the same language, Somali.
The most difficult language to learn is Basque, which is spoken in northwestern Spain and southwestern France. It is not related to any other language in the world. It has an extremely complicated word structure and vocabulary.
Dogs can’t distinguish between red and green.
All babies are colour blind at birth.
Although our nose and ears keep growing throughout our lives, our eyes remain the same size from birth.
The cornea is the only tissue in the human body which doesn’t contain blood vessels.
Your eyes become tired when you read or stare at a computer, this is because you blink less often.
An ostrich’s eye is bigger than its brain.
Out of all the muscles in your body, the muscles that control your eyes are the most active.
Each of your eyes has a small blind spot in the back of the retina where the optic nerve attaches. You don’t notice the hole in your vision because your eyes work together to fill in each other’s blind spot.