Nearly twice as many emperor penguins inhabit Antarctica as was thought.

UK, US and Australian scientists used satellite technology to trace and count the iconic birds, finding them to number almost 600,000.
Their census technique relies in the first instance on locating individual colonies, which is done by looking for big brown patches of guano (penguin poo) on the white ice.
High resolution imagery is then used to work out the number of birds present.
It is expected that the satellite mapping approach will provide the means to monitor the long-term health of the emperor population.
Climate modelling has suggested their numbers could fall in the decades ahead if warming around Antarctica erodes the sea ice on which the animals nest and launch their forays for seafood.
"If we want to understand whether emperor penguins are endangered by climate change, we have to know first how many birds there are currently and have a methodology to monitor them year on year," said Peter Fretwell from the British Antarctic Survey (BAS).
"This study gives us that baseline population, which is quite surprising because it's twice as many as we thought, but it also gives us the ability to follow their progress to see if that population is changing over time," he told BBC News.
The scientists have reported their work in the journal PLoS One.
Their survey identified 44 key penguin colonies on the White Continent, including seven that had not previously been recognised.
Although finding a great splurge of penguin poo on the ice is a fairly straightforward - if laborious - process, counting individual birds in a group huddle is not, even in the highest resolution satellite pictures.
This means the team therefore had to calibrate their analysis of the colonies by using ground counts and aerial photography at some select sites.

Source:BBC NEWS
http://www.bbc.co.uk/news/science-environment-17692025