Channel Islands National Park and Marine Sanctuary provide habitat for significant breeding populations of four species of pinnipeds (California sea lions, northern fur seals, harbor seals and northern elephant seals). These species may be viewed during a channel crossing or from various locations on the islands, including:

• Anacapa Island:California sea lions, harbor seals
• Santa Cruz Island: California sea lions, harbor seals
• Santa Rosa Island: California sea lions, harbor seals, northern elephant seals
• San Miguel Island: California sea lions, harbor seals, northern elephant seals, northern fur seals, Guadalupe fur seals (rare), Stellar sea lions (very rare)
• Santa Barbara Island: California sea lions, northern elephant seals, harbor seals