Hi,my 8 week old mallard (one of 3) seems completely fine except the last two days he's got a hoarse sounding quack.It's been rainy and cool here in NY , and I leave them outside in a playpen all day then they come in at night. The water I fill the pool with comes from the hose...maybe too cold? They are almost fully feathered now...all but their heads. Any help would be greatly appreciated

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