Edwin Giesbers / Konik Wild Horse (Equus ferus caballus) mother and foal standing on grassy hummock. The Netherlands, July.

Robert Thompson / Lichen (Cladonia coccifera) with red spore-producing reproductive structures, growing in hummock of moss, Mourne Mountains, County Down, Northern Ireland, UK, January

Robert Valentic / Triodia hummock grassland in the Simpson desert, SW Queensland, Australia

Robert Valentic / Jewelled gecko {Strophurus elderi} climbing through a clump of Hummock grass at night, Coombah, New South Wales, Australia

Robert Valentic / Centralian blue-tongued skink {Tiliqua multifasciata} basking next to hummock grass shelter site, Nanutarra Roadhouse, Western Australia

Robert Valentic / Rusty topped delma legless lizard {Delma borea} leaves the security of dense Hummock grass to hunt insects at night, East Kimberley, Western Australia

David Kjaer / Wheatear (Oenanthe oenanthe) female perched on grassy hummock, North Uist, Scotland