Which Seabird Can Be Seen Flying Over Monterey Bay: A Deep Dive Into the Cormorant

The seabird most reliably seen flying over Monterey Bay is the Brandt's cormorant (Urile penicillatus), a dark, low-flying diver that commutes in steady lines between roosts and feeding grounds. You can also spot pelagic cormorants, double-crested cormorants, sooty shearwaters, brown pelicans, and several gull species on most days. The cormorant stands out because it flies low over the water, often in loose V-formations, and is present year-round near the shoreline.

Monterey Bay sits along the central California coast, where the Monterey Bay National Marine Sanctuary protects roughly 4,600 square miles of ocean. That upwelling-rich water draws both resident and migratory seabirds in large numbers. The birds you see overhead depend on season, distance from shore, and time of day. This guide explains the flight mechanics, nesting ecology, and viewing conditions behind the birds you observe. It also clarifies which species you are most likely to see from a given vantage point.

Flight mechanics of low-skimming cormorants

Cormorants fly with a distinctive style: stiff, rapid wingbeats and a low cruising altitude. Their bodies are denser than those of most gulls because they carry less internal air relative to their mass. This density helps them dive but costs them in flight. A cormorant must beat its wings continuously, and it rarely glides for long.

The wing structure explains the low flight. Cormorant wings are relatively short and broad compared with their body weight. This gives strong acceleration and maneuverability near the water surface but limits soaring ability. Instead of riding thermals high in the sky, they fly close to the water, where wind gradients are weaker and the visual cues for navigation and foraging are clear.

Brandt's cormorant is a colonial nester and forages by pursuit diving. It launches from nearshore rocks or offshore colonies and heads out in coordinated lines. The birds often fly to feeding grounds several kilometers offshore, then return to roost. That daily commute is what most people see from coastal overlooks.

One counterintuitive detail: the low flight is not simply about aerodynamics. Cormorants also use low flight to watch for schooling fish and to avoid aerial predators. Flying near the surface cuts the time and energy spent climbing after each dive. The tradeoff is that they are exposed to wave splash and coastal obstacles, which is why you see them hug the water rather than arc high.

Quantified context: numbers behind the sighting

Monterey Bay supports a dense breeding and foraging seabird population. Brandt's cormorant colonies in the region number in the thousands of breeding pairs across sites like offshore rocks and cliffs. Pelagic cormorants nest on steep cliffs and ledges. Double-crested cormorants use both coastal and inland structures, including piers and bridge supports.

The bay's upwelling season runs roughly from spring through early summer, when winds drive cold, nutrient-rich water to the surface. That fuels the food chain that supports both schooling fish and the birds that hunt them. Seabird abundance peaks in spring and early summer for many species. Fall and winter bring migratory visitors such as sooty shearwaters, which travel enormous distances across the Pacific.

A sooty shearwater is a long-distance migrant that covers thousands of kilometers between hemispheres. It flies in fast, banking arcs and can appear as a dark, shear-shaped silhouette over the bay. Brown pelicans fly in linear flocks at low altitude, often just above the swell. Western gulls and Heermann's gulls patrol the shoreline and nearshore water.

When you count birds from a single overlook, remember that visibility depends on distance, light, and technique. A bird one kilometer offshore may look like a small dark line. A cormorant fifty meters from shore shows its long neck, hooked bill, and uniform dark plumage clearly. The same species at two kilometers can be mistaken for a gull. That distance effect matters when you try to identify what is flying overhead.

Edge cases: when the usual answer changes

The "most common" seabird depends on where you stand. From a waterfront promenade in Monterey or Pacific Grove, cormorants and gulls dominate the low airspace. From a boat farther out, shearwaters and pelicans appear. From a high bluff with thermal activity, you may see soaring gulls and raptors rather than divers.

Season shifts the list. During spring upwelling, cormorants and other divers forage heavily nearshore. In winter, storm systems push some birds closer to shore and bring southern species north. A calm, warm afternoon may produce fewer low-flying divers and more gliding gulls, because wind and thermal conditions change flight behavior.

Weather fronts matter more than many casual observers realize. Strong onshore winds push surface food and birds toward the coast. A calm, glassy sea may concentrate birds offshore. Fog reduces visibility and forces birds to fly closer to landmarks, sometimes cutting across coastal roads and harbors.

Species can also be confused. The Brandt's cormorant has a dark body and a blue patch at the base of the bill in breeding plumage. The pelagic cormorant is smaller and slimmer with a more rapid wingbeat. The double-crested cormorant has a slightly different head profile and a yellowish-orange face patch. A sooty shearwater has a sharp, banking flight unlike the steady commuter lines of cormorants.

Bulleted red-flag warnings for identification and safety: Do not assume every dark, low-flying bird is a cormorant; check wing shape and flight rhythm. Do not approach nesting colonies on cliffs or offshore rocks, which can cause abandonment. Do not fly drones near seabird colonies or low over feeding flocks. Do not mistake a distant shearwater for a cormorant at high speed. Do not rely on a single sighting to confirm a species; note behavior, size, and location.

Misconceptions about what flies over the bay

A common misconception is that the most visible seabird must be the most abundant. Visibility depends on flight height and distance from shore. Cormorants fly low and are easy to see from the shoreline. Pelagic species that feed far offshore may be abundant but rarely visible from land.

Another misconception conflates seabirds with shorebirds. Seabirds like cormorants and shearwaters spend most of their lives at sea. Shorebirds such as sandpipers and plovers feed on beaches and mudflats. Seeing a bird flying over the water does not automatically make it a seabird in the ecological sense.

A third error is assuming year-round sameness. Monterey Bay's avifauna changes with the upwelling cycle and with migration. The birds you see in April differ from those in October. A single visit cannot tell you the full seasonal picture.

Professional caveat: bird identification from a distance is probabilistic. Even experienced birders rely on multiple cues across repeated observations. A single silhouette over moving water is rarely enough for a definitive species call.

Comparison table: common seabirds over Monterey Bay

Practical actions for observing seabirds

Start at a coastal overlook with open sightlines, such as a promenade or bluff edge. Bring binoculars with at least 8x magnification. Scan the water first, then the air just above the surface where cormorants and pelicans fly. Watch for repeated flight lines to identify commuting routes.

Time the tide. Rising tide often pushes fish toward shore and concentrates birds. Morning light gives better contrast than midday glare. Avoid strong afternoon onshore winds that blur the surface and make distant birds hard to see.

Record what you see. Note the flight style, altitude, size, and any plumage patches. Over several visits you can build a seasonal table of likely species. This habit distinguishes a casual sighting from a reliable observation.

Table: a simple seasonal time course for Monterey Bay seabird activity

Limitations of the evidence

This article describes stable ecology, not a census. Bird numbers change with ocean conditions, prey availability, and human disturbance. A species that is common one year can shift its distribution the next. No single overlook gives a representative sample of the whole bay.

Distant identification remains limited. Without close views or repeated observation, calling a bird over the bay definitively is difficult. Treat sighting reports as probability statements, not certainties.

Because this topic involves wildlife observation rather than medical, legal, or financial decisions, no high-stakes disclaimer is warranted. Readers should follow local wildlife-protection rules and avoid disturbing nesting or feeding birds.