I have relatives in Australia who worked for the sugar industry.
Turns out that unrefined sugar is kept in gigantic open barns, and moved around with bulldozers --- not a clean process. Of course, birds and animals get in, and frequently die there, and then the sugar does... sugar things... to them.
As a result there is apparently a legal limit as to the maximum permissible number of crystallised parrots per tonne in Australian sugar.