Butterflies of North America Screen Saver

The Butterflies of North
America Screen Saver and Wallpaper rotates 60 spectacular photos of colorful butterflies.
All butterflies have been seen north of Mexico, as verified by the North
American Butterfly Association's butterfly checklist. Optional captions let
you display both the common and scientific names of each insect in your
choice of font and screen position. You can also select up to 23 transition
effects, show images full-screen or original size, and specify the length of time pictures appear on screen.
System-tray and desktop-based screen-saver controls (which work with any
screen saver) are part of this excellent package. You can enjoy this
nag-free trial version for up to two weeks.