It is estimated that there are about 1,300 species of bats in the world, with populations varying widely by species and region. Some species, like the common pipistrelle bat, are widespread and abundant, while others, such as the Rodrigues fruit bat, are critically endangered with fewer than 10 individuals remaining.
A more accurate estimate would require a comprehensive survey of bat populations in every country and region, which is challenging because bats are difficult to detect and count. Such a survey would provide valuable information for conservation efforts.