My calculation is 7000 species
there are 12,000-14,000 species of ants
22,000 species
Yes. Many species of ants eat caterpillars.
Many species of ants produce formic acid in their venom.
Many species of ants live in tunnels that are in and underneath mounds of dirt called anthills; some live in burrows in trees.
there are 20,000
There are many species of ants on this planet.
It is absolutely impossible to know how many fire ants there are in the world. The number of ants in one colony can be thousands upon thousands.
Today, more than 12,500 species are classified with upper estimates of about 22,000 species. (Wikipedia)For the source and more detailed information concerning your request, click on the related links section (Wikipedia) indicated directly below this answer section.
over 20,000 and they all are very small including red ants which bite there are two species of them
The two species would not meet, since they live in different parts of the world.
There are about a dozen species that commonly are seen as pest problems in the home. There are many hundreds of species in the US, and therer are uncountable bazillions of individual ants. The most frequent invaders of homes are carpenter ants (about 6 types), odorous house ants, moisture ants, and fire ants. In the yard you will find all these plus thatching ants.