The videos are heartbreaking. But they also give a voice and face to a problem that, Hahn says, many of the California sea lions are facing.
"We've been having problems, of course, with pup mortality," Hahn, who isn't affiliated with any rescue groups but stops by the beach every day to document and check up on the population, told The Dodo. "We count something like 30 of them every single year between January and June."
Hahn said the sea lions normally breed on the Channel Islands, but have altered their breeding patterns, she suspects, due to a lack of food caused by overfishing.
She said she believes the sea lion mothers are being stressed by human interference, which could be causing the miscarriages and pup mortality. On one hand, she said, locals are fed up with the noise and waste caused by the sea lions and try to deter them from the beaches.
On the other hand, tourists will often try to interact with the sea lions and harass them. "The public are actually encouraged to get really close and it's because San Diego is a tourist town," she said. "We've had some biting incidents."
Hahn said she's hoping the videos of the grieving mothers will bring some empathy into the debate - and hopefully inspire the public to embrace more humane ways of dealing with to the local sea lions.
While the videos are painful to watch, they also serve as a touching reminder of just how deeply these intelligent animals can feel emotions. They might not speak our language, but maternal love knows no species.
You can learn more about what to do if you find a stranded sea lion, or donate to the Marine Mammal Center to help care for rescued sea lions.