Here's a link to a setup for a large collapsible bridge:
http://www.bay12forums.com/smf/index.php?topic=87165.msg2369781#msg2369781
How do I make the FB to get on the platform before destroying the bridge leading to it? Will the FB ignore the bridge if a higher priority bait is in place on the platform?
If it destroys the bridges, then you shoot it with siege engines - OR you put a secondary bridge over the area where the FB would be idling if it destroys the bridges and is just standing there...
If it can fly, time for plan B.
You can put chained animals on the bridge itself, if you build the bridge as a floor rather than as a bridge. If the bridges are open to allow access to the main bridge, and the FB sees a chained creature sitting there, it will normally attack the chained creature first. While it's killing your chained wardogs, your leverpuller drops the FB, the dogs, and the whole bridge platform 20 Z levels down...
If you want to make sure you kill even fliers, make it a double-decker bridge - put a support in the middle of the walking bridge, and put a same size platform above it. Link all three suports to the same lever, so that you send a FB & wardog stone sandwich into the deep, even if the FB can fly. You will want lots of dogs on the bridge though, to keep the FB there long enough for your dwarves to pull the lever.
I honestly prefer more passive methods, but this has worked decently when I played with it.