According to a Mercury News report, about 50 dead leopard sharks (Triakis semifasciata) were found in Redwood Shores, California last month. California Department of Fish and Game necropsy results from one of the sharks indicated that the animal had suffered internal bleeding, but biologists have yet to determine the cause of the die-off of the animals.

In addition to the leopard sharks found in Redwood Shores, the Mercury News reports that hundreds of leopard sharks have washed up throughout the San Francisco Bay Area, according to Pelagic Shark Research Foundation.

You can check out the full story at MercuryNews.com.