You could have downloaded Batz! Screensaver 2.1 for Mac from our software library for free. This software for Mac OS X was originally created by Skyrocket Software. Batz! Screensaver for Mac lies within Theming Tools, more precisely Screensavers.
From the developer:
Batz! Screensaver... One of the most misunderstood mammals, bats are actually very beneficial to mankind and the environment. They help control harmful insect populations, as well as rain forest regeneration, among other benefits. Although much of western culture fear or loath bats, many cultures view bats as symbols of happiness, and good luck.
The only mammal truly able to fly, there are hundreds of species of bats.
You may want to check out more Mac applications, such as Freezelight Clock screensaver, Screensaver + or iTunes Screensavers, which might be related to Batz! Screensaver.
Screensavers
Screensavers