Using easy round numbers, there are approximately 4,000 mammal species in the world and bat species constitute close to 1,000 of them. Bats are especially important in arid and semi-arid climates that have night-blooming flowers. These plants depend on bats for pollination.
See
Bat Conservation International.
Jennifer J. W. Vann and Rocío Diaz M. are working on bat conservation as well as agave and mezcal projects in Michoacán and plan to produce a documentary. Visit them at
http://conceptocircularte.blogspot.mx/
It is exciting to see this project. Bats are varied and interesting, but often maligned in folklore and people's beliefs.
Look at this cute guy.