Recent news about bill color pattern of the Roseate Terns

Veronica Neves from the Azores reports that bill color change for Roseate Terns in the Azores is similar to the pattern described by Cormons for Roseate Terns on Great Gull Island.

Tony Tree reports from South Africa that the color change from black to red on the bills of Roseate Terns he studies is, “virtually complete, if not complete, at the time the eggs hatch.”