The Duke of Sussex lunged into action to flick away the critters from a woman delivering an emotional speech.
His random act of pest control tickled Meghan who was seen cracking up by his side.
The Duchess was also seen wiping critters away from her face.
Before visiting the Oz city of Dubbo, the royals were warned of the humidity and the likelihood of flies and mosquitoes.
And they found themselves swamped as they met members of the Flying Doctors on the airfield runway.
After arriving at the airport, Pregnant Meghan Markle and dad-to-be Prince Harry were given a crash course in maternity from Oz Flying Doctors – who showed them a mannequin in 'labour'.
Meghan revealed she is expecting her and Prince Harry's first child in the Spring of next year, on Monday.
The announcement five months after their big day has sparked speculation that the royal tot was conceived on their mini-moon to Dublin – or even at a pal's wedding.
Earlier Luke Vincent melted hearts by stroking Harry's beard and giving Meghan a massive cuddle moments after the pair left the royal plane.
They arrived in the city of Dubbo today as the couple's Australian tour continues.
The royal couple – who announced they were expecting their first child on the eve of their first overseas tour together – will help celebrate 90 years of the Royal Flying Doctor Service while there.
They will also visit farmers hit by drought and travel to Victoria Park for a picnic to celebrate community spirit.
Mum-to-be Meghan arrived wearing jeans by Aussie brand Outland, a shirt from Maison Kitsune, Boots from J Crew and a jacket from her friend Serena Williams' collection and necklace by Natalie Marie.
She will join Harry visiting a local school working with young Aboriginal and Torres Strait Islanders.
The Duke of Sussex said he and his wife "could not think of a better place to announce the upcoming baby" than Australia.
Kensington Palace revealed that their first child is due next spring, with Meghan saying they are both "excited" about parenthood.
The couple were given the first toys for the new arrival, with the parents-to-be handed a soft kangaroo and joey by his Excellency General the Honourable Sir Peter Cosgrove and his wife, Lady Cosgrove, at a welcoming ceremony at their Admiralty House residence in Sydney, overlooking the harbour.
It was at the same venue hours later where Harry, addressing an afternoon reception, said: "We couldn't think of a better place to announce the upcoming baby".
In remarks which went from sincere to humorous, the duke spoke of his pleasure at being able to show off Australia to the duchess.
"This is my wife's first visit here so I'm very excited to show her this wonderful country of yours," he said.
"Thank you, Your Excellency and Lady Cosgrove, for giving us your magnificent home for the week. We are inviting all of our mates in Sydney to visit.
"And we also genuinely couldn't think of a better place to announce the upcoming baby, whether it's a boy or a girl, so thank you very very much.
"We are really impressed to see you serving beer and tea at an afternoon reception in true Aussie style."
After the speech, Meghan spoke to guests including Australian TV personality Eddie Woo, who said his own children – aged five, seven and 10 – require "a lot of energy", to which she replied: "We're ready! We're excited to join the club."
Harry and Meghan spent their first day in Sydney getting close to wildlife, including meeting two namesake joeys, and were greeted by hundreds of well-wishers outside the famous Opera House after watching an Aboriginal and Torres Strait Islander modern dance company.
- Couple will fly to the town of Dubbo, situated on the Macquarie River, 186 miles north of Sydney
- Spend time with the Royal Flying Doctor – life-saving aviation services
- Visit farmers hit by drought
- Travel to Victoria Park for picnic to celebrate community spirit
- Afternoon visit to local school working young Aboriginal and Torres Strait Islanders
The duchess, wearing an ivory Karen Gee dress with earrings and a bracelet which belonged to the duke's mother, Diana, said "Our first baby gift!" when the Governor General handed her the kangaroo.
The couple were greeted his residence by flag-bearing representatives from the 18 countries who will be competing at the Invictus Games in Sydney.
Several of them congratulated the couple on their baby news, with Meghan replying: "Thank you so much. We are very excited."
The dignitaries also presented them with Akubras – traditional wide-brimmed Australian hats.
At Taronga Zoo, the couple got the chance to meet Harry and Meghan, two joeys which were named after the couple to mark their nuptials earlier in the year.
Meghan said the koalas were "so, so sweet", while Harry reached out to pet one and asked about their diet and sleeping habits.
The pair also encountered other wildlife at the zoo on the shores of Sydney Harbour, with staff showing off wallabies, quokkas and a short-legged echidna, which seemed very taken by the royal guests.
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