At first, I thought these were the sheddings of some white dog.
On closer inspection, I noticed a couple of weird red bugs on them.
One even had a 'face' on its back!
A jogger at the park pointed to the tree above us and explained that the white fluff came from seed pods dangling from the tree.
Fluffy fiber from the seed pod
Kapok is used as stuffing for pillows, mattresses, and upholstery, as insulation material, and as a substitute for absorbent cotton in surgery.
And the Hitler bug was actually a red cotton stainer.