Photo by Kelvin Cope
Emperor penguins (Aptenodytes forsteri ) are endemic in the Antarctic and are known to breed in winter. In order to survive the cold winds, penguins huddle together without moving to create a tightly packed unit . This allows them to conserve energy and maintain their body temperature .
Huddle movement is also observed where directional movements may originate from any huddle caused by a single penguin. This movement was even compared to a traffic jam . The small forward movement by cars in traffic situations are the same with 2 cm movements of penguins within a huddle . This movement causes their neighbour to move a step closer in the same direction, in the end merging small huddles with the bigger huddles [1, 2].
To know more about Emperor penguins, visit SeaLifeBase.
 IOP Institute of Physics (2013) Traffic jams lend insight into emperor penguin huddle. http://www.iop.org/news/13/dec/page_62141.html [Accessed 19 December 2013].
 Zitterbart DP, Wienecke B, Butler JP, Fabry B (2011) Coordinated Movements Prevent Jamming in an Emperor Penguin Huddle. PLoS ONE 6(6): e20260.