Exposure to sulfur-rich volcanic soil may increase production of pheomelanin, a pigment that gives a reddish tint to the feathers of barn owls living on remote volcanic islands Barn owls (Tyto alba) ...

There are many sulphur (yellow) butterflies in southern Florida and, lucky for us, they are present all year round. The most abundant of the sulphur butterflies are the orange barred sulphur, the ...

Life on a volcanic isle appears to give barn owls a blush of red-brown plumage. The high-sulfur environment on such islands influences the birds’ coloration, researchers report March 13 in the Journal ...