However, a small number, around 100 known species, are able to cause disease.
There are 2,867 known species of plants found in Israel.
There are more than 10,000 known species in this class.
It is the only known aquatic species in its family.
This name is sometimes used for nearly all the known species of the group.
The area is home to 56 known species of mosquitoes.
And there are still many known species that no one has had the time to name yet.
With more than 9,000 known species, this family is one of the largest on Earth.
There are nearly 20,000 known species of bees on earth.
One third of known species are under threat - do they have more than a future on film?