A trip to a remote Newfoundland island to visit one of the last strongholds of the extinct great auks.

Ecuador’s Los Cedros Reserve, one of Earth’s most biodiverse habitats, could be wiped out by mining. A court case could save it — and set a precedent for the planet.

An operation to discourage poachers by removing a rhino calf’s horn serves as a stark reminder of the protections that need to stay in place for these imperiled species.