I used to rear thousands of ducks back in the 80s for a certain very large company in Lincs. We brooded them on one farm up to 3 w.o. and then split the flocks into larger fattening houses to finish them. One Winter's day we moved 6000, 3000 going into each fattening house. The lads were in a hurry it being a Friday and all, and didn't flick the upper bolt across on the outer doors to stop it dropping down if the wind blew and the doors jiggled a bit. Nor in their haste did they put a row of straw bales across the bottom of the doors as an extra 'just in case' like we normally did. Well the wind blew, the bolt dropped down, and the doors blew open allowing about 80 birds to rush out the doorway before they blew shut behind them. They might have been alright but that house was nearest to our cage in which we used to leave fertilizer sacks cable tied with dead birds in for the maggot man to collect twice a week, and which attracted the attention of foxes regularly (hence the cage). There were usually one or two either sitting on the cage or starng into it if you went round late at night.
Next morning when I arrived the doors were blown shut, and huddled outside looking petrified and exhausted were about 30 birds. The rest were round the corner, 12 without heads buried neck first in tiny little scrapes in the ground, and about 2 dozen pairs of legs were all that was left of 12 more. Scattered along the side of the house for about 100 ft were another 20 -30 birds that had just been chased up and down for fun until they died from fright or exhaustion. Poor little beggars.