On the cover

A double-banded plover ( Charadrius bicinctus) chick at Lake Ellesmere, New Zealand. These shorebirds breed in New Zealand and then overwinter in Australia. Australia has 37 migratory waders, many of which are endangered. Eight million shorebirds migrate along a flyway between Australasia and the Arctic, relying on intertidal zones, which are increasingly under threat. Image by Jonathan Harrod (Minden Pictures / Alamy Stock Photo).