David Attenborough’s latest series, Mammals, continued on Sunday - and one scene proved very emotional for those tuned in.
The legendary biologist and natural historian continued his series exploring the remarkable adaptability of different mammals.
The fourth episode in the series, titled Cold, explored the unique physical traits and behaviours of mammals living in some of the coldest parts of the world.
In one heartbreaking part of the episode, Attenborough narrated as newborn seals were left separated from their mothers for the first time.
While most are reunited, some of the mothers are never able to find their babies after leaving them for the first time, and the helpless pups die of starvation after getting lost.
One lost seal could be seen screeching as it looked for comfort but was rejected by a different seal mother.
"Sadly, not all mothers get it right," Attenborough explained, adding: "Some never find their pups again."
He continued: "Alone and hungry, an abandoned pup understandably seeks comfort.
"But this nearby mother won't share her milk, her priority is her own pup."
The mother could then be seen moving the abandoned pup away from her as it cried out and eventually left, alone and weak.
Fans were "heartbroken" by the scenes though, with many admitting they'd become emotional watching the helpless pups lost and dying.
Taking to X, formerly Twitter, one person penned: "Omg that’s so sad, this is heartbreaking, all these babies losing their mothers and just dying slowly on the ice whilst crying out for their mothers #mammals."
"I guess it’s just the circle of life but it is really sad," another added, while someone else wrote: "It's too sad."
A fourth shared: "Don't go making me cry now. that little pup looked so lost and sad #mammals."
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"Switched on the telly hoping for something nice. Got dying seal pups. Unbearably cute seal pups. Abandoned and dying. Thanks, Attenborough. #mammals," another quipped.
"Those pups! #Mammals," one more wrote along with a crying emoji.
Another added: "Nooooo! Poor baby seal pup #Mammals #wildlifephotography." (sic)
