© The Wildlife Trust of South and West Wales.A dead immature grey seal.
Two-thirds of the total number of Atlantic grey seal pups on Skomer Island, off the coast of Pembrokeshire , perished in the wake of storms Ophelia and Brian.
Those that managed to survive sustained injuries to their heads or bodies.
Others were separated from their mums by the weather and were spotted washing up on beaches along the Pembrokeshire coast.
Unless they are found by their mums they will likely starve to death.
© The Wildlife Trust of South and West WalesA seal pup crushed by storms
The stranded seal was unharmed but its mother was no where in sight.
The seal population on the island is carefully monitored by the Wildlife Trust of South and West Wales.
The charity said in recent years the numbers have been "really healthy" but "natural events" like storms can often have a "profound impact".
The average number of pups born each autumn on Skomer is about 160 but in 2015 Skomer Wardens recorded 240.
It is feared the loss of so many pups will have a profound impact on the island's population.
Baby grey seals are distinguished by their white coats which begin to moult at around three weeks old before being replaced with a waterproof one.
The storms also decimated many of the charities' buildings on Skomer and nearby island Skokholm leaving them "unrecognisable".
The Trust now needs to raise £25,000 to fix the damage.
Lizzie Wilberforce, Conservation Manager for Skomer and Skokholm said: "These storms were the strongest since 1987 and unfortunately, violent storms like these are becoming more common as our islands are exposed and vulnerable to severe weather.
"It is vital that we start to put protocols in place to better deal with the potential impacts, on both the islands' wildlife and infrastructure."
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