People with severe allergies may want to steer clear of down or feather products. The researchers who published a recent study point out that sleeping on feathers can cause hypersensitivity pneumonitis and idiopathic pulmonary fibrosis. These respiratory illnesses set in when a person breathes in dust from bird feathers.
Fact
Blue-eyed lemurs are one of two (non-human) primates to have truly blue eyes.