how to make a movie clip disappear?

[Schlave]

I'm using the tutorial 27 - timer controlled events to make a movie clip "swanbird" appear randomly on the screen.
Trouble is I don't know how to make it such that each duplicate will disappear in 2 seconds.

What code should I type in? Is it typed into the frame containing the timing code and the swanbird movieclip, or the swanbird movieclip, or the movieclip containing the timing code?

[mpol777]

instead of duplicating you can use just one clip then. instead of making another and then moving it to a random postion just apply the random positioning to the clip you already have.