Fake 3d perspective, whats this effect called?

programming flash
1

Hello,

whats it called when stuff in the foreground moves faster than stuff in the background?

I want to make an effect like this …
http://www.krazydad.com/bestiary/bestiary_ostrich.html

but want it to scroll left and right depending on cursor being on left or right of stage.

Any Ideas?
:toad:

2

parallax

3

thanks again TC! that narrows it down

4

Can anyone make the birds appear not so random?

so the birds appear like this

…/|
./ |
/. |. \

straight lines of perspective

5

which way are they flying?