Over 5.6 million people watched the third episode of the award-winning series on One on Sunday.

As a result of constant environmental change, animals around the world are fighting for survival in the eight-part series.

In the Guardian, episode one was described as “yet more majestic TV” by the veteran broadcaster.

Rebecca Nicholson wrote in a five-star review, “This awe-inspiring series has a scale that is simply spectacular.” This series can be enjoyed purely for its incredible footage, but it will also horrify you.

In the six years since Planet Earth last appeared on our screens, this third series finds itself in a darker mood.”

Over five years across 43 countries, Sir David, 97, narrates this documentary filled with footage from overhead drones and remote-controlled deep-sea submersibles.

In the first episode, we explore coasts from Kent to South Africa, Mexico to Australia, and beyond. Two cautionary tales are discussed, centered on the Caribbean flamingos on Mexico’s Yucatán Peninsula and the similarly endangered green turtles on Raine Island on the Great Barrier Reef.

“The footage of desert lions paddling in the sea to catch cormorants mid-air in pitch darkness was amazing,” she wrote. “Miserably, the poor Caribbean flamingos having their entire nests wrecked by worsening storms (attributed to climate change), their chicks scrambling pathetically onto rocks, as Attenborough’s voice doomily explained: ‘Soaked and cold [they] will soon perish unless they can get out of water. Some years no chicks survive.”