The video appears to be first time fans have heard Louis speak, and the first time they've heard George and Charlotte speak straight to a camera.

\"The Duke and Duchess of Cambridge are pleased to share a short video clip of Prince George, Princess Charlotte and Prince Louis each asking Sir David Attenborough a question about the natural world,\" Kensington Palace said in a press release.

Prince William and Kate and their three children met with Attenborough just over one week ago when he visited the gardens of Kensington Palace so he and William could attend an outdoor screening of Attenborough's documentary, \"David Attenborough: A Life On Our Planet.\"

During that visit, Prince George received a gift from Attenborough, described by Kensington Palace as a, \"tooth from a giant shark, the scientific name of which is carcharocles megalodon ('big tooth'), which Attenborough found during a family vacation to Malta in the 1960s.\"

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A post shared by Duke and Duchess of Cambridge (@kensingtonroyal) on Sep 26, 2020 at 2:30pm PDT

Prince William has spoken out recently about his work on conservation and the environment, particularly how he wants to make the world a better place for his kids. William's conservation work is the focus of a new documentary, \"Prince William: A Planet for Us All,\" premiering Oct. 5 on ITV in the United Kingdom.

\"My grandfather, my father, have been in the conservation, the environmental work for many years. My grandfather was well ahead of his time. My father was ahead of his time,\" William says in the documentary, referring to his father, Prince Charles, and grandfather Prince Philip. \"And I really want to make sure that, in 20 years, George doesn't turn around and say, 'Are you ahead of your time?' Because if he does, we're too late.\"

Attenborough also appears in the documentary, including in a scene in which Kate tells the historian that George, Charlotte and Louis are \"massive fans\" of his.

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