Zebrafish Development Caught on Film

Here's a sweet time-lapse movie of a developing zebrafish embryo.  It's not mine; I found it on Youtube.  The first panel is a fertilized zebrafish egg consisting of only 2 cells (the 2 "lumps" on top of the large sphere, which is termed the yolk sac.  The cells divide to the 4 cell-stage, then the 8-cell stage, the 16-cell stage, etc and over the course of 24 hours develops a very recognizable head, tail and eye.  Towards the end of the movie the zebrafish flips over and you can't see it's head, unfortunately--guess he/she was camera-shy.