Gabriel Rojo / Salt lake, pink in colour due to bacteria (Dunaliella salina) Salinas Grandes de Hidalgo, La Pampa, Argentina

Franco Banfi / Pygmy blue whale (Balaenoptera musculus brevicauda) subspecies of blue whale, tail, Mirissa, Sri Lanka, Indian Ocean. Endangered species.

Roland Seitre / Dingo (Canis lupus dingo) Birdsville, Queensland.

Denis-Huot / Masai giraffes (Giraffa camelopardalis tippelskirchi) walking across dry lake, Amboseli National Park, Kenya.

Steve O. Taylor (GHF) / Bus travelling across the Tenere desert, central Niger, 2005.

Paul Harcourt Davies / Few-flowered Orchid (Orchis pauciflora) Terni, Umbria, Italy, May.

Paul Harcourt Davies / Few-flowered Orchid (Orchis pauciflora) Mount Peglia, Orvieto, Umbria, Italy, April.

Jouan Rius / Irregular ripples on gypsum sand dunes created by high winds, White Sands National Park, Chihuahuan Desert, New Mexico, USA, December 2012.

Sandra Bartocha / Mist over wetland area, with sparse trees next to woodland, Serrahnbruch, Muritz National Park, Germany, May

Mark Hamblin / 2020VISION / Loch Garten and Abernethy Forest. Cairngorms National Park, Scotland, UK, September 2011. Did you know? The human population in the Cairngorms is very sparse – just 4.2 people per square kilometre.

Mark Hamblin / 2020VISION / Sparse Scots pine woodland in winter, Glenfeshie, Cairngorms National Park, Scotland, UK

Sandesh Kadur / Arunachal Macaque (Macaca munzala) feeding on leaves from sparse branches. Arunachal Pradesh, eastern India.