• "Brazilian biologists are investigating the deaths of more than 500 penguins found washed up on the beaches of Rio Grande do Sul state. Autopsies are being conducted on some of the birds to determine the cause of death. Researchers said the penguins appeared to have been well-fed, with no apparent injuries and no oil on their bodies. Similar incidents in the past have been blamed on shifting ocean currents and colder temperatures...

Source BBC News: http://www.bbc.co.uk/news/world-latin-america-18838918