This bird species was extinct in Europe. Now it's back, and humans must help it migrate for winter

How do you teach a bird how, and where, to fly? The distinctive Northern Bald Ibis, hunted essentially to extinction by the 17th century, was revived by breeding and rewilding efforts over the last two decades. But the birds—known for their distinctive black-and-iridescent green plumage, bald red he...