Observing white shark predation

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.


Lighthouses and Migrants

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