The all-black swans that glide across New Zealand’s wetlands today are only a lame replacement for the bulky beasts that lived there in the past, scientists have discovered.
When humans first arrived in New Zealand in the thirteenth century, they found it swimming in black swans. But quickly, it seems, they hunted the birds to extinction. By the time Europeans arrived in the late eighteenth century, the swans were gone. But black swans had lived in Australia all along, and these birds wer