The contents of the 'black balls' that washed up on Sydney, Australia beaches last month have been identified after weeks of analytical testing.

When hundreds of golf ball-sized black balls mysteriously washed onto the beaches of Sydney, it caused enough alarm for the areas to be closed off to the public.

The mystery of the black balls that washed up on some of Sydney’s most iconic beaches last month has now been solved – and it’s more disgusting than you could ever imagine.