A small team of environmental scientists from several institutions in Italy and Switzerland has found evidence suggesting that at least some of the red plumage sported by barn owls on small, isolated islands may be due to the ingestion of sulfur. In their study, reported in the Journal of Biogeography, the group studied the preserved skin of thousands of barn owl specimens from multiple geographic locations archived in museum collections.
Click here for original story, Sulfur may be partly responsible for reddish feathers in barn owls on remote islands
Source: Phys.org