Every fall, the white sharks return to the Farallon Islands from their annual migration to the middle of the Pacific Ocean. We typically see the first shark predation event during late August, and then the number of predations increase through September to when they peak in October.
In the fall, sharks migrate to the coast of California, including the Farallon Islands, to feed on pinnipeds (seals or sea-lions) when the abundance of immature animals is at its peak. This gives us a unique opportunity to study them. On September 27 as we were watching from the Lighthouse atop Southeast Farallon Island, a swarm of gulls began to circle and a pool of blood was observed in Fisherman’s Bay, indicating that a shark had just found a meal.
For the first few decades that PRBO worked on the Farallones, a powerful rotating light on the lighthouse acted as a beacon to lost ships, birds, and bats. An analysis of 38 years of hoary bat arrivals on the island revealed that nights during the dark phases of the moon had a greater likelihood of
Sign up for Point Blue News
Stay up-to-date on our science, get our quarterly newsletters directly to your inbox, and don't miss an opportunity to support critical conservation.