HALF MOON BAY (KRON) — In the past five weeks, found whales have washed up on Northern California Beaches.

Tuesday, a dead grey whale appeared in Half Moon Bay. Two whales have recently washed up on the shore in Pacifica, one in April and one in early May. Also in April, a killer whale washed up near Fort Bragg.

There are still a lot of unanswered questions that scientists are trying to figure out, but experts say it isn’t necessarily a cause for concern.

Moe Flannery with the California Academy of Sciences says it’s not uncommon. “It’s pretty typical to have multiple whales strandings in a year, just not in the same county,” Flannery said.

Flannery went on to say that on average three to four whales a year wash up along California beaches. She did say that the cause of death in these recent cases does appear to be different.

One hypothesis as to why more whales are coming closer to the shore this year is because warmer water is making it harder for whales to find food.