Species that have no long-distance migratory relatives, such as the waxwings Bombycilla, are effectively moving in response to winter weather and the loss of their usual winter food, rather than enhanced breeding opportunities.
কোন প্রজাতির দীর্ঘ-দূরত্বের কোন পরিযায়ী আত্মীয় নেই?
the waxwings Bombycilla