Juan Carlos Munoz / Palm tree branch dipping towards water, Puerto Jimenez, Golfo Dulce, Osa Peninsula, Costa Rica.

Stefan Christmann / Sea ice with hollows where Emperor penguin (Aptenodytes forsteri) breeding colony stood whilst huddling. Atka Bay, Antarctica. July.

Graham Eaton / Folded Carboniferous age sandstone and shale (Culm Measures) in plan view, deformed by compression during the Variscan or Hercynian orogeny, a geologic mountain-building event caused by Late Paleozoic...

Graham Eaton / Steeply dipping beds of Carboniferous age sandstone and shales (Culm measures) on the flank of a large fold. This deformation was formed by compression during the Variscan or Hercynian orogeny, a geol...

Graham Eaton / Small Waterfalls at Sandy Mouth beach, near Bude, Cornwall, UK, March. The rocks are steeply dipping Carboniferous age, sandstone and shale (Culm Measures).

Graham Eaton / A small waterfall at Sandy Mouth beach, near Bude, Cornwall, UK, March. The rocks are steeply dipping Carboniferous age, sandstone and shale (Culm Measures).

Graham Eaton / Speke's Mill Mouth waterfall near Hartland Quay, Devon, UK, March. The waterfall flows down near vertical beds of Carboniferous sandstone.

Nick Upton / Young boy held by his mother as he dips fishing net into stream, Bristol, UK, October 2014. Model released.

Graham Eaton / Steeply dipping beds of Silurian age turbidite sediments, Clarach Bay, Aberystwyth, Wales, UK, September 2014.

Roland Seitre / Fishing cat (Prionailurus viverrinus) dipping paw in water, Singapore Zoo, Singapore. Captive, occurs in Asia. Endangered species.

Andrew Parkinson / Gannet (Morus bassanus) adult dips its tail to slow down, whilst dropping a wing as it prepares to plunge dive. Shetland Islands, Scotland, UK, July.

Neil Aldridge / Red-breasted merganser (Mergus serrator) male swimming on sea loch and dipping beak below surface before leaving frame, Scotland, UK.