Time-lapse photography is a technique whereby the frequency at which film frames are captured (the frame rate) is much lower than that used to view the sequence. When played at normal speed, time appears to be moving faster and thus lapsing. For example, an image of a scene may be captured once every second, then played back at 25 frames per second; the result is an apparent 25 times speed increase. Time-lapse photography can be considered the opposite of high speed photography or slow motion.
Processes that would normally appear subtle to the human eye, e.g. the motion of the sun and stars in the sky, become very pronounced. Time-lapse is the extreme version of the cinematography technique of undercranking, and can be confused with stop motion animation.
All photographers who are interested time lapse photos with DSLR cameras, I recommend the E-Book by Gunter Wegner on recording, subject choice, interval settings and eliminating the flicker during post processing with LRTimelapse software.
Infos about the E-Book and LRTimelapse software as freeware here: http://lrtimelapse.com
Timelapse comes in many varieties, for example I describe my planning and execution here. The time lapse should include the sunrise from the highest mountain in Cyprus, the mount Olympos.
Since I know many locations for bird photography as a nature photographer I often connect my photo tour recordings with the search for suitable places for timelapse.