Toxins, diseases ruled out for death of Namibian seal pups Adjust font size: WINDHOEK, Dec. 15 (Xinhua) -- An investigation into the cause of death of seal pups off the Namibian coast has ruled out toxins and diseases as the cause of death, NGO Ocean Conservation Namibia(OCN) official said on Tuesday. According to Naude Dreyer, OCN marine biologist, the tests done by scientists from around the world came out negative for toxins and diseases. "There was no presence of diseases. We are still waiting for more tests but for now we can conclude that the seal pups and mothers died of starvation because the seal moms were so thin there is definitely a link to starvation," Dreyer said.