BBC: Hundreds of penguins have been washed up dead on the beaches of Brazil. Scientists are still investigating what could have caused the death of around 500 animals found on the shores of Sao Paulo state. They say autopsies carried out on some of the carcasses suggest they could have starved to death, as their stomachs were completely empty. They are now trying to establish if strong currents and colder temperatures may be to blame. Thiago do Nascimento of the …