Richards is a guide with Understand Down Under, a company that runs the Moonwalk, a monthly, full moon, sunset to sunrise tour of Royal National Park.

BBC: Moonwalk in Sydney's Royal National Park

In Royal Chitwan National Park, near Nepal's south-western border with India, dozens of elephants were tramping through the thick jungle, their riders carrying rifles and chattering on walkie-talkies.

ECONOMIST: The kindness of hunters

They were immobilised with drugs, put in wooden crates and driven in lorries to Royal Bardia National Park in the far west of Nepal, where the rhino population was once depleted by hunting.

ECONOMIST: The kindness of hunters

There have also been important contributions from the Forestry Commission, Brecon Beacons National Park Authority, and the Royal Society for the Protection of Birds.

BBC: nightjar-RSPB images

Other organisations involved in the water vole reintroduction include the Royal Zoological Society of Scotland, Scottish Natural Heritage, Loch Lomond and the Trossachs National Park and water vole expert Derek Gow.

BBC: Water voles back in the Trossachs