Story highlights One of world's only known albino humpbacks is spotted off Australia

Nicknamed "Migaloo," the whale's movements are being tracked by researchers

Migaloo was first seen in 1991 as a juvenile, experts say

This is the third year in a row he's been spotted

"Thar he blows!" In a scene straight out of Moby Dick, a rare white whale is back and putting on a show for his fans off the eastern coast of Australia this week.

First spotted on Tuesday, the albino humpback has been nicknamed "Migaloo" by researchers who track his movements.

On Thursday he was seen swimming along Sydney's coast on his annual migration. This is the third year in a row he's been spotted

Photos: Photos: Albinos of the animal kingdom Photos: Photos: Albinos of the animal kingdom Albinos of the animal kingdom – The albino humpback whale nicknamed Migaloo cruises along the eastern coast of Australia near Coffs Harbour with another whale in 2005. On Thursday, June 19, he was spotted swimming along the coast near Sydney on his annual migration. Hide Caption 1 of 14 Photos: Photos: Albinos of the animal kingdom Albinos of the animal kingdom – A rare 300-pound marlin was caught and released off the coast of Costa Rica during a fishing trip run by Maverick Yachts and Maverick Sportfishing Tours on March 11. It's being called the first-ever recorded albino blue marlin, according to the company's Facebook page . It's unclear whether the fish was albino or leucistic, retaining some essence of its normal pigmentation. Hide Caption 2 of 14 Photos: Photos: Albinos of the animal kingdom Albinos of the animal kingdom – An albino killer whale nicknamed Iceberg, the only all-white, adult killer whale ever spotted, travels in a pod of 13 orcas near Bering Island off the coast of Russia. Hide Caption 3 of 14 Photos: Photos: Albinos of the animal kingdom Albinos of the animal kingdom – A rare albino tammar wallaby and its twin at Chris Humfrey's Wild Action Zoon in Macedon, Australia. Hide Caption 4 of 14 Photos: Photos: Albinos of the animal kingdom Albinos of the animal kingdom – Two-week-old Sri Lankan Albino cobras at the National Zoological Gardens in Colombo, Sri Lanka. Hide Caption 5 of 14 Photos: Photos: Albinos of the animal kingdom Albinos of the animal kingdom – An albino baby turtle swims with green sea turtle babies in a pond at Khram island, Thailand. Hide Caption 6 of 14 Photos: Photos: Albinos of the animal kingdom Albinos of the animal kingdom – A wild white donkey on the island of Asinara, Italy. The donkey is an albino variant of the more common Sardinian donkey. Hide Caption 7 of 14 Photos: Photos: Albinos of the animal kingdom Albinos of the animal kingdom – These two white albino alligators live in the Alligator Bay zoological park in Beauvoir, France. Hide Caption 8 of 14 Photos: Photos: Albinos of the animal kingdom Albinos of the animal kingdom – Two albino porcupines compete for a corn cob at the Kamla Nehru Zoological Garden in Ahmedabad, India. Hide Caption 9 of 14 Photos: Photos: Albinos of the animal kingdom Albinos of the animal kingdom – An albino hedgehog in the Zoo of the Botanical Garden in the Russian Black Sea resort of Sochi. Hide Caption 10 of 14 Photos: Photos: Albinos of the animal kingdom Albinos of the animal kingdom – A rare albino buffalo grazes in Hellsgate National Park in Naivasha, Kenya. Hide Caption 11 of 14 Photos: Photos: Albinos of the animal kingdom Albinos of the animal kingdom – An albino squirrel in Hout Bay, South Africa. Hide Caption 12 of 14 Photos: Photos: Albinos of the animal kingdom Albinos of the animal kingdom – A rare albino southern right whale calf surfaces at West Australia's Flinder's Bay. Hide Caption 13 of 14 Photos: Photos: Albinos of the animal kingdom Albinos of the animal kingdom – A rare baby two-humped camel stands with its mother in a private zoo at the Crimean resort of Yalta. Hide Caption 14 of 14

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Albino whales are rare and Migaloo is one of only a small handful of documented all-white humpback adults, according to Oskar Peterson, who runs a website that tracks sightings of white whales around the globe.

"We have photos of a junior Migaloo from a few years ago, but we haven't seen him since so we don't know if he survived the South Ocean," said Peterson.

"But there is a 100% white whale we've seen photographic proof of in Norway, so Migaloo isn't quite as unique as we once thought."

Migaloo was first seen in 1991 when he was a juvenile and researchers believe he is now in his 20s.

He doesn't show up every year, but his journey is part of the humpbacks' annual migration from the Antarctic to their breeding grounds along the Great Barrier Reef.

"The helicopter crews are all out photographing him today," said Oskar Peterson. "He's giving us all quite a parade this year."

Migaloo passed by Cronulla in Sydney's south on Thursday afternoon and would soon be seen by whale watchers at Bondi Beach, Peterson said.

Spotters of the whale are sharing sightings, photos and video at his Twitter account, Migaloo1

Male humpbacks can travel up to 140 kilometers (87 miles) a day during their migration, according to experts.

Researchers warn fans to steer clear -- at least 500 meters away at all times -- to ensure the whale's survival. Too much noise and chasing can disturb him and cause him to use precious energy he needs for migration.

But whale watchers may be able to enjoy Migaloo for decades. Humpback whales are believed to survive as long as 90 years in the wild.