Template:POTD/2010-06-26
A juvenile House Sparrow (Passer domesticus) has a pink bill and nestling gape flanges on both sides of its face where the upper part of the beak is connected to the lower part. In juvenile altricial birds, brightly colored gapes help the parents determine how to distribute food among their chicks.Photo: Muhammad Mahdi Karim
 | This picture of the day has been featured on Portal:Birds. |