Experts are hoping an incredibly rare albino humpback whale might be spotted off theSouth Coast or Illawarra this week.

The young female whale , which has been named Siale, is only the second albino humpback known on Australia's east coast, after the hugely famous Migaloo.

Siale was spotted off Ulladulla last week by a drone operator from whale rescue organisation ORRCA , with the brief footage proving enough to identify her.

But she was heading north, while migrating whales usually head south at this time of year, and observers don't know why.

"This is extremely rare," ORRCA's Pip Jacobs said.

"It's estimated that just 1 in 40,000 humpback births are albino humpbacks."

ORRCA was able to track Siale's movements until the weekend, when she was spotted off Swansea near Newcastle on

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