What Actually Makes Water Roll Off a Duck's Back?
https://www.youtube.com/watch?v=Q-8GXk9r0ik&feature=emb_logo
Ducks and geese spend a lot of time preening their all-weather feathers. This obsessive grooming – and a little styling wax from a hidden spot on their back side – maintains the microscopic feather structure that keeps them warm and dry in frigid waters.
Why would you not want to know this?