A seal is seen at seaside of Wellington, New Zealand, June 10, 2020. Wellington has been named New Zealand's best destination in the Lonely Planet guidebook, with the city branded "one of the coolest little capitals in the world". (Xinhua/Guo Lei)

More than 5,000 seal pups had been found dead at Pelican Point beach in Namibia's coastal town of Walvis Bay, NGO Ocean Conservation Namibia (OCN) said on Wednesday.

According to Naude Dreyer, OCN marine biologist, there are thousands of seal pups being born prematurely and dying almost immediately.

"It is a natural phenomenon, meaning that when the pregnant female feels she does not have enough reserves, she can abort her fetus. A few premature deaths is a natural event, but thousands of premature dead pups is extremely rare," said Dreyer.

Dreyer suspects the seals are aborting because of different reasons which include toxins, diseases or starvation because fish might have moved far away from where the seals live.

"The seals look a bit thin and it could likely be caused by a lack of food. Other seal colonies at other beaches look much better and they do not record the same amount of premature pups," said Dreyer.

The Ministry of Fisheries and Marine Resources confirmed the death and said it is investigating the cause of the deaths.

"We are gathering data for analysis to determine the causes of the abortions. The tests are specialized tests which are not done in Namibia. We will have to send the samples to South Africa," said Graca Dalmeida, director of resource management.