There are a number of ways to create a slow motion effect in Adobe's Premiere Pro CS4. I've chosen "Time Remapping" because it's relatively quick 'n easy and can be done with a great deal of precision regarding the degree of slow motion and the exact frames of the clip when slo-mo begins and ends. There is also the means to gradually reduce the motion, then later gradually increasing it back to real time to avoid abrupt changes (if desired).
These sparrows are ideal subjects for slow motion study (as opposed to box turtles or sleeping cats) because of their hyperactivity around the birdfeeders. This clip was shot using a Canon 7D in 720p resolution which enabled me to go as high as 60 frames per second. When I reduced the speed of the clip from 60 fps by over a factor of 5 (down to 10.8 fps) there are still enough frames per second to allow smooth, not jerky, movement.
This is only a 2 1/2 minute clip using a Canon 100-400L telephoto lens. The first half is zoomed in tight at 400 mm and starts in real time, then quickly slows down for a short time, and then speeds up. Ditto when zoomed out to 100 mm.