Go to editor:
In debug console do this:
cam = "Seagull" camcreate getposatl player;
close the debug console, watch the bird be on ground flapping its wings.
Then do this in the debug console:
cam camcommand "landed"
and watch nothing happen.
The config from configfile >> "CfgMovesBird" >> "States" >> "Open" doesn't give any clues either.