TABLE 3. Diurnal Densities by species between Honolulu and San Francisco, April 1966. Species # Birds Birds/Linear Mile Laysan Albatross 8 0.008 Black-footed Albatross 71 0.077 Wedge-tailed Shearwater 106 0.115 Sooty Shearwater 67 0.073 Pterodroma externa 1 0.001 Pterodroma sp. 3 0.003 Storm Petrel (White rump) 33 0.036 Shearwater-Petrel 22 0.024 Red-tailed Tropicbird 3 0.003 White-tailed Tropicbird 1 0.001 Brown Booby 3 0.003 Red-footed Booby 66 0.072 Great Frigatebird 1 0.001 Shorebird sp. 3 0.003 Sooty Tern 136 0.148 Arctic Tern 1 0.001 Common Noddy Tern 7 0.007 Herring Gull 19 0.020 Sabine Gull 2 0.002 Tern sp. 3 0.003 Gull sp. 9 0.010 Tropicbird sp. 1 0.001 Bird sp. 2 0.002 Pomarine Jaeger 10 0.011 578 0.625