Sir David Attenborough marked his 100th birthday on Friday, and for Australians the milestone highlights decades of deep connection with the continent that helped shape the world’s understanding of our wildlife, landscapes and fragile ecosystems.

As tributes continue to pour in from around the world, the documentary maker said he was “completely overwhelmed” by the birthday messages.

“I had rather thought that I would celebrate my 100th birthday quietly, but it seems that many of you have had other ideas,” Sir David said in an audio message.

“I simply can’t reply to each of you separately, but I’d like to thank you all most sincerely for your kind messages, and wish those of you who have planned your own local events a very happy day.”

That global outpouring of affection reflects a remarkable career that has repeatedly returned to Australia over decades.

By the time the natural history pioneer first slipped into the waters of the Great Barrier Reef in 1957 to film for Zoo Quest, television broadcasting had only arrived in Australia the year before, and in black and white.

Wearing little more than snorkelling gear, he helped introduce audiences to an underwater world few had ever seen.

That early visit marked the beginning of a lifelong bond that would see Australia become his second-most visited filming destination after the United States, and ahead of his home nation, the United Kingdom.

He returned in 1963 for Quest Under Capricorn, capturing the red deserts of the Northern Territory and documenting Indigenous cultures at a time when such stories were rarely broadcast internationally.

Over the decades that followed, Australia became a cornerstone of his landmark documentaries, from the marsupial-filled landscapes of Life on Earth to filming tiger snakes on Carnac Island for Life in Cold Blood.

One of the most famous moments in Sir David’s extensive catalogue comes from footage of the Australian lyrebird mimicking chainsaws and camera shutters, a sequence later voted British viewers’ favourite Attenborough moment.

Evolving from storyteller to environmental advocate, it was the reef he first explored as a young presenter that truly highlighted that shift.

When he returned in 2014 and 2015 to film Great Barrier Reef with David Attenborough, he descended 300 metres in a submersible to reveal deepwater corals never filmed before.

The stunning images came with a stark warning — losing the reef would be a global catastrophe, and Australians had both the privilege and duty to protect it.

His influence has left a permanent imprint on Australian science. Researchers have honoured him by naming species and fossils after him, from ancient fish to spiders and rare Tasmanian invertebrates.

He previously declared the fossil-rich Riversleigh World Heritage Area one of the world’s most important fossil sites.

In 2016, scientists named a newly discovered extinct miniature marsupial lion from the Riversleigh deposits Microleo attenboroughi in his honour.

Australian institutions have also embraced the broadcaster who inspired generations of scientists. The Australian Museum named him Lifetime Patron in 2017, recognising decades of collaboration that included lectures and visits to its Lizard Island Research Station.

A year earlier, his virtual reality documentaries premiered there before travelling the world.

In 2008, he was elected a Corresponding Member of the Australian Academy of Science, cementing his academic ties to the nation.

He was also admired by the late Australian conservationist Steve Irwin, with Sir David once describing him as a “born communicator.”

The connection also runs through the family. His son, Robert, built his career within the School of Archaeology and Anthropology at the Australian National University in Canberra.

At universities including the University of Sydney, professors have noted he remains the number one inspiration for first-year conservation students.

Even in his tenth decade, his voice continues to shape environmental debate. His 2025 film Ocean with David Attenborough has been embraced by groups including Greenpeace and WWF, which are using its message to push for ratification of the Global Ocean Treaty and the creation of a marine sanctuary in the Tasman Sea.

A century after his birth, Sir David has cemented a legacy that continues to unfold in Australia and around the world, as we celebrate the man who taught generations to look more closely at the natural world.