Mysterious black balls that washed up on Sydney beach were foul-smelling mini ‘fatbergs’

These mysterious black balls you’re referring to are indeed known as “fatbergs”. They are masses of fat, oil, and non-biodegradable matter that conglomerate in sewer systems and sometimes wash ashore. Their presence on beaches is definitely an issue as they have the potential to harm wildlife and also pose a significant risk to human health because they often contain harmful bacteria and other microorganisms. The name “fatberg” is a portmanteau of “fat” and “iceberg”, indicating their large size and predominantly fat-based composition. If you find one on the beach, it’s recommended not to touch it and to notify local authorities immediately.