the gang broke into an aviary and bundled 200 of the animals into sacks and containers around 3.30 am on january 12 .
cctv showed the men took the birds to a tower block in walsall , west midlands , and dumped them on the floor before kicking them and forcing them out of barely open windows .
the birds were also jammed into drawers , squeezed to death and will be sentenced next month .