Dấu Hiệu Mùa Xuân: Chim Di Trú Tìm Về Tổ Ấm, Phần 2/2

Every year, millions of birds participate in this seasonal movement called migration. It’s a big event for we birds and a great wonder of nature. Today I’ll do my best to explain more about bird migration. There are many different species of birds that go on such amazing journeys.