Explore North Coast and the Humboldt Bay Aquatic Center as co-sponsors invites the public to their Lecture Series on Killer Whales Here and Worldwide featuring Jeff Jacobsen. Jeff will talk about the recent increase in sightings of the mammal eating type of killer whales along the Northern California coast. On 30 May a group of six were observed off of Fort Bragg 'playing' with sea birds. The next day another group was photographed by a local fisherman leaving Humboldt Bay with a sea lion they had just killed. On 12 June eight other killer whales were seen off of Eureka.