I have 2 Isa Browns and two Japanese Bantams and the Isa Browns seem to have no idea how to waterproof their feathers When ever it rains they look like someone has plucked half of the feathers of they are only about 6 months old so im wondering if they will learn to waterproof them or just stand out in the miserable weather.At first i thought they would learn but when i got my bantams i saw today that they have manged to. So are my Isa Browns Dumb or do different breeds pick it up faster