2cy+ September (Mongolia). Some ad birds retain one or several RR from the pre-br or last year's post-br moult. By now, these feathers are extremely worn and show sharp contrast to the freshly moulted post-br RR. [82406635]
2cy+ September (Mongolia). Some ad birds retain one or several RR from the pre-br or last year's post-br moult. By now, these feathers are extremely worn and show sharp contrast to the freshly moulted post-br RR. [82406635]