Princess Eugenie Shares Rare Photo of Son August Bonding with Princess Beatrice’s Daughter Sienna

Princess Eugenie is sharing an intimate look into her family life in celebration of Earth Day.

The granddaughter of Queen Elizabeth, 33, posted a selection of photographs on Instagram Saturday to mark the annual occasion, including an adorable snapshot of son August Philip bonding with cousin Sienna Elizabeth.

In the image, August, 2, can be seen watching penguins at a zoo exhibit while standing beside Sienna, 1 — whose parents are Princess Eugenie’s sister, Princess Beatrice, and her husband, Edoardo Mapelli Mozzi.

“It’s World Earth Day and today is all about celebrating our planet and people doing amazing things that help protect it,” Princess Eugenie began the caption of her post, before describing what each photograph shared shows.

“Photo 1: August and his cousin Sienna love going to the London Zoo. It’s part of the Zoological Society of London @zsllondonzoo a global wildlife conservation charity that helps to restore habitats and protect wildlife,” she said, detailing the first image posted. “Every time you visit you are supporting their work.”

Can’t get enough of PEOPLE‘s Royals coverage? Sign up for our free Royals newsletter to get the latest updates on Kate Middleton, Meghan Markle and more!

Related:Sarah Ferguson Says She’s ‘So Proud’ of Daughters Beatrice and Eugenie on U.K. Mother’s Day

In second and third images, Princess Eugenie shared snapshots of August immersing himself in the BBC Earth Experience, which is currently located in London “in a totally sustainable building dedicated to the BBC’s Natural History Unit’s footage of our earth,” per the royal.

“Their vision is to inspire visitors to protect the planet through this immersive experience,” she continued.

Never miss a story — sign up for PEOPLE’s free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.

Follow-up images show Princess Eugenie cleaning oysters. “Who knew oysters were so cool,” she wrote, describing the photos.

Princess Eugenie added: “One oyster can clean up to 200L of water a day. @bluemarinefoundation are leading an initiative called @solentseascapeproject which is restoring coastal marine life with a collection of partners making it one of the most ambitious environmental projects in the UK!”

RELATED VIDEO: Princess Eugenie and Jack Brooksbank Hold Hands at Royal Easter Outing Ahead of Welcoming Second Child

In the final image posted in her carousel, Princess Eugenie — who is currently pregnant and expecting her second baby with Jack Brooksbank — shared a glimpse of her son and husband underneath a blossoming tree.

“Photo 6: Because I love them and they love nature,” she wrote with the photograph.

Princess Eugenie previously announced that she is expecting in a statement released by Buckingham Palace in January.

“Princess Eugenie and Mr. Jack Brooksbank are pleased to announce they are expecting their second child this summer,” the palace said in the announcement. “The family are delighted and August is very much looking forward to being a big brother.”

For more People news, make sure to sign up for our newsletter!

Read the original article on People.