Blue-footed Booby

The Blue-footed Booby is a large tropical seabird of the eastern Pacific, instantly famous for one feature: a pair of vivid turquoise-blue webbed feet. Those feet are not just decoration. During courtship the male lifts them one at a time in a slow, exaggerated high-stepping strut, and females consistently prefer the males with the brightest, bluest feet. The color comes from carotenoid pigments in fresh fish, so a brilliant foot is an honest advertisement that a bird is healthy and hunting well. Foot color can fade noticeably in just a couple of days if a bird goes hungry.

Away from the colony, the booby is a superb marine hunter. It patrols warm coastal waters from Mexico to Peru, spots schooling fish from the air, then folds its wings and knifes into the sea in a steep plunge-dive, sometimes from heights of roughly 10 to 30 meters. The name booby comes from the Spanish bobo, meaning fool or clown; sailors coined it because the birds were tame and comically awkward on land. On the Galapagos Islands, where a famous population breeds, that fearlessness lets visitors watch the dance from just a few steps away.

The Blue-footed Booby is a big, streamlined seabird, roughly goose-sized but slimmer, with a long dagger-shaped bill, narrow pointed wings, a wedge-shaped tail, and those unmistakable blue feet. The body pattern is brown above and clean white below, with a streaky brown-and-white head and neck that looks finely frosted at a distance. Sexes look similar, but females are noticeably larger and appear to have a bigger, darker pupil (actually a ring of pigment around it). In flight the bird is all points, bill, wings, and tail forming a cigar-with-wings silhouette typical of boobies.

Male vs. female

Males and females look alike in plumage, but there are reliable ways to separate them at the colony. Females are distinctly larger and heavier, which is typical of boobies. The quickest clue is the eye: females have a ring of dark pigment around the pupil that makes it look larger than the male's, so a big-eyed bird is a female and a small-pupiled bird is a male. Voice settles any doubt instantly, since males whistle and females honk. Males also tend to have slightly brighter feet on average and, being lighter, they can dive in shallower water closer to shore.

Juveniles

Juvenile Blue-footed Boobies are browner and messier-looking than adults. The head, neck, and upper breast are dark sooty brown rather than finely streaked, the white underparts are duller, and the feet are the giveaway that is missing: young birds have dull grayish or bluish-gray feet that only develop the vivid turquoise as they mature over their first years. They can suggest a Brown Booby at a glance, but that species shows a crisp, sharply cut line between dark breast and white belly, while young Blue-foots look smudgy and blended. Full adult plumage and bright feet come in gradually before birds begin breeding at roughly three to four years old.

Blue-footed Boobies have no song in the songbird sense, but their colonies are noisy, and the sounds are genuinely useful for identification because the sexes differ so sharply. Males give thin, plaintive, drawn-out whistles, a surprisingly delicate sound for such a big bird, often delivered while sky-pointing with bill, tail, and wingtips raised toward the sky. Females and immature birds produce hoarse, honking or trumpeting quacks and grunts, more like a goose than a whistle. Pairs often duet during courtship, the male whistling and the female honking back.

A displaying colony is a constant mix of whistles, honks, and the shuffling slap of blue feet on rock. Away from the breeding islands the birds are mostly silent, so a quiet bird plunge-diving offshore gives you plumage and shape to work with, not voice.

The Blue-footed Booby lives along the eastern Pacific coast of the Americas, from the Gulf of California and the west coast of Mexico south past Central America, Ecuador, and northern Peru. The two strongholds are the islands of the Gulf of California and western Mexico, and the Galapagos Islands, which hold a substantial share of the world population and are where most travelers see the species. It also breeds on arid islands off Ecuador and Peru, such as Isla de la Plata in Ecuador, sometimes called the poor man's Galapagos.

This is a bird of warm, productive inshore waters. Unlike some boobies that forage far out to sea, Blue-foots typically hunt within sight of land, over upwellings and bait schools near their colonies, and they breed on bare, rocky or sandy island slopes with little vegetation. Adults are largely resident year-round, though they disperse along the coast outside breeding, and vagrants occasionally wander north; small numbers have famously turned up in California, especially during warm-water years.

Blue-footed Boobies eat almost nothing but fish, chiefly small schooling species such as anchovies, sardines, and flying fish, plus mackerel and occasional squid. The hunting method is spectacular: a bird cruises 10 to 30 meters up, spots a school, then folds its wings tight and hits the water like a thrown spear, using air sacs in the skull and a streamlined body to absorb the impact. They also make shallow slanting dives and can even snatch flying fish in mid-air.

They frequently hunt cooperatively, with flocks locating a bait ball and raining down in near-simultaneous dives that overwhelm the school. Males, being smaller and lighter, tend to work shallower inshore water, while the heavier females can plunge deeper and farther out, a division that lets a pair exploit different food and bring different-sized prey to their chicks. Because foot color depends on fresh carotenoid-rich fish, a booby's diet is literally on display every time it dances.

Blue-footed Boobies nest in loose colonies on open ground, and they barely build a nest at all. The pair scrapes a shallow depression in bare earth, and as incubation proceeds the sitting birds squirt guano outward, leaving the eggs ringed by a distinctive white circle of droppings that effectively marks the territory. Courtship continues at the site: sky-pointing, mutual bowing, the famous foot-lifting parade, and males presenting small sticks or pebbles to the female in a token gesture of nest-building.

The female typically lays two eggs, sometimes one or three, several days apart, and both parents incubate for roughly 41 to 45 days using their warm, blood-rich webbed feet instead of a brood patch, standing over the eggs with the webs wrapped around them. Because eggs hatch asynchronously, the first chick has a head start, and in lean years it commonly monopolizes food or attacks its sibling so that only one survives, a well-documented example of facultative siblicide. In good years both chicks fledge at around three months. Breeding is tied to ocean conditions rather than a strict calendar, and colonies can skip or fail in warm El Nino years when the small fish disappear.

The Blue-footed Booby is not a backyard bird, it is a tropical seabird you travel to see, but few birds in the world are easier to watch well once you are in the right place. Colonies are famously tame, and at several reserves the birds dance and nest within a few steps of marked trails. Here is where and how to see one.

• Galapagos Islands, Ecuador: the classic destination. Cruises and day trips visit dancing colonies at sites such as North Seymour, Espanola (Punta Suarez), and Punta Pitt on San Cristobal, with birds courting at arm's length.
• Isla de la Plata, Ecuador: a day trip from Puerto Lopez on the mainland coast, with an accessible breeding colony and far lower cost than a Galapagos cruise.
• Gulf of California, Mexico: boat trips from La Paz, Loreto, and other Baja ports pass breeding islands, and plunge-diving flocks are a regular sight over bait balls.
• Timing: courtship and nesting are not tightly seasonal and vary by colony, but in the Galapagos some pairs are displaying or tending chicks in most months, so almost any visit offers good viewing.
• From the United States: rare but annual vagrants reach coastal California, especially the Salton Sea and San Diego area during warm-water events; check rare bird alerts if one is being reported.
• Watch responsibly: stay on marked trails, keep the required distance (about 2 meters in the Galapagos), and never block a bird's path between nest and sea; the birds ignore calm, quiet observers.

• Brown Booby: Solid chocolate-brown head and breast ending in a sharp, clean line against the white belly, with yellowish feet; Blue-footed shows a streaky pale head and turquoise feet
• Nazca Booby: Mostly white-bodied with black flight feathers, a black facial mask, and an orange-pink bill; shares Galapagos colonies but lacks blue feet
• Peruvian Booby: White-headed booby of the cold Humboldt Current off Peru and Chile with dark feet; overlaps with Blue-footed in the south and occasionally hybridizes