Bogans in Australian parks like to muck around there late at night.
Presumably this is because none of them have homes decent or large enough to host parties in or, most likely, they'd rather do their depraved activities and leave their filth where someone else has to clean it up.
American author John Zeaman describes them as Shadow People; never seen by regular folk but identified only by what they leave behind.
Classic examples of Shadow People (aka Bogan)'s rubbish includes beer bottles (invariably smashed), crushed cans, syringes, Maccas wrappers and urine.
Milly regularly snuffled up free bonus feeds from left-over Red Rooster chicken bones, discarded Krazy Kebab wrappers and the occasional spilt thick shake that had solidified during its downward slide into the gutter.
Here in Geneva, the parks too are the favoured haunts of the Swiss-French Shadow People/Bogans, who we'll call Crapauds to distinguish them from their US and Antipodean counterparts.
Crapauds in our park leave behind iced tea boxes, mandarin peels, boulangerie bags and exploded fireworks.
Free food for Milly this morning was half an apple, several stale baguettes and a sly lick of an upended bottle of Guinness.
I'm yet to decide what conclusions to draw.