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

Doug Gimesy / Grey-headed flying-fox (Pteropus poliocephalus) just after having taken a flying high speed belly-dip into the Yarra river at the end of a very hot day. Yarra Bend Park, Kew, Victoria, Australia. Crop...

Doug Gimesy / Grey-headed flying-fox (Pteropus poliocephalus) in flight, taking a flying high speed 'belly-dip' into the Yarra river at the end of a very hot day. They do this to wet their fur which both...

Doug Gimesy / Grey-headed flying-fox (Pteropus poliocephalus) in flight, taking a flying high speed 'belly-dip' into the Yarra river at the end of a very hot day. They do this to wet their fur which both...

Doug Gimesy / Grey-headed flying-fox (Pteropus poliocephalus) in flight, taking a flying high speed 'belly-dip' into the Yarra river at the end of a very hot day. They do this to wet their fur which both...

Doug Gimesy / Grey-headed Flying-fox (Pteropus poliocephalus) in flight just after a belly-dip into the Yarra river at the end of a very hot day. They do this to wet their fur which both acts as a form of evaporati...

Doug Gimesy / A Grey-headed Flying-fox (Pteropus poliocephalus) in flight just after having taken a flying high speed belly-dip into the Yarra river at the end of a very hot day. They do this to wet their fur which...

Bernard Castelein / Indian cormorant (Phalacrocorax fuscicollis) flying close to the water surface intending to dip water and bringing it to the chicks in its nest, Keoladeo NP, Bharatpur, India

Jeff Foott / Cottonwood (Populus sp) trees in riverine dip in autumn, Grand Staircase-Escalante National Monument, Utah

Jeff Foott / Fremont Cottonwood (Populus fremontii) trees in riverine dip in autumn, Deer Creek Canyon, Grand Staircase-Escalante National Monument, Utah

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...