A trumpeter swan glides across the surface of the Yellowstone River. Trumpeter swans once faced extinction; today their numbers are rebounding.
A trumpeter swan glides across the surface of the Yellowstone River. Trumpeter swans once faced extinction; today their numbers are rebounding.
一只号声天鹅滑过黄石河河面。号声天鹅一度濒临灭绝，不过现在，它们的数量正有所上升。