Lisa Hoffner / A baby orphan Elephant (Loxodonta africana) leaning against the rump of its friend. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, August 2010.

Laurent Geslin / Grey heron (Ardea cinerea) perched on stone wall in urban park, with people walking behind, Paris. France, November.

Nature Production / Sunflower {Helianthus annuus} shoots pushing up a stone as they germinate, Japan

Sue Flood / Humpback whale mother pushing her calf up to the surface (Megaptera novaeangliae), Kingdom of Tonga, South Pacific. 2005

Jane Burton / Newly hatched Bantam chick {Gallus gallus domesticus}. Chick struggles out of the egg pushing with head and feet.

Andrew Parkinson / Flightless dung beetle {Circellium bacchus} female rolling buffalo dung ball to lay egg in , Addo Elephant park, South Africa

David Woodfall / Sequence of strips of cultivated Machair with early shoots of Black oats (Avena strigosa) pushing through the sand. North Uist, Scotland, UK, June.

Yashpal Rathore / Bengal tiger (Panthera tigris tigris) resident tigress (T33) with three young cubs pushing out intruder young female (MV3) from her territory. Kanha National Park, Central India. Camera trap image.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) brooding its own chick and pushing away another. Atka Bay, Antarctica. September.

David Woodfall / Strips of cultivated Machair with early shoots of Black oats (Avena strigosa) pushing through the sand. Uist, Outer Hebrides, Scotland, UK, June.

Ashley Cooper / Man pushing out boat in Funafuti Atoll, Tuvalu. March 2007. This area is low lying and very susceptable to sea level rise.

Ann & Steve Toon / African elephant (Loxodonta africana) bull pushing over tree, Zimanga Private Game Reserve, KwaZulu-Natal, South Africa.