There's about 1.8m (6 feet) long DNA inside every cell nucleus in our body, and an average adult body contains around 50 trillion (million million) cells.
Some migratory birds have a "magnetic compass" in their body (a sense called Magnetoreception) to help them navigate using Earth's magnetic field.
The catfish father keeps the eggs in his mouth until they are ready to be hatched.
The tiny Water Bear (Tardigrade) can survive environments extreme enough to kill any other animal - with temperatures as low as -273°C close to Absolute Zero to as high as 151°C.
Corneas are the only tissues that don't require blood.
The Giant Kelp algea (Macrocystis pyrifera) is the fastest growing organism on earth and can grow at a rate of 70cm (two feet) a day.
Dolphins only "sleep" half awake - keeping one eye open while consciously breathing and floating on surface.
The length between your elbow and hand (forearm) equals the length of your foot.
If you fully stretch your arms out, the fingertip to fingertip length is almost exactly your body height.
The lightest organ in the human body is the lung.
An ostrich egg is also the largest existing single cell.
A kind of jellyfish (Turritopsis nutricula) upon reaching adulthood can transform itself back to childhood by converting its cells. It may repeat this to live forever.
To avoid predators, a mother Slow Loris licks its offspring with poison before sending them off to search for food.
The fungus Cordyceps is able to "mind-control" other insects like ants to climb plants and attach there to become its food.Submitted by: Bright Tiger - Flemington, New The biggest egg in the world is the ostrich egg. It could take as many as 30 chicken eggs to equal its volume, and up to 2 hours to hard boil.
The largest frog in the world is The Goliath Frog of Gabon in West Africa and can grow as big as 33cm long and up to 3kg heavy.
When the queen of a clownfish school dies, a male clownfish changes its gender to become female and takes her place.
The life of an eyelash is about 5 months.