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?
Categories: Misc
McGST 
Fascinating! There are several YouTube channels I subscribe to that cover this kind of info regularly. They are almost all PBS.
https://www.youtube.com/c/veritasium
https://www.youtube.com/c/physicsgirl
https://www.youtube.com/c/itsokaytobesmart
https://www.youtube.com/c/smartereveryday
Thanks Tom, will take a look