Bonaire’s Diverse Habitats Offer Solutions for Survival

The Salt Ponds: A Buffet Along the Migration Highway

The southern salt ponds are among Bonaire’s most iconic landscapes. Their brilliant shades of pink and white, along with azure and cobalt-blue waters, attract photographers and tourists. But for birds, these shallow waters represent something much more important: food, safety, and space.

Unlike many coastal areas around the Caribbean, the salt ponds remain relatively undisturbed. Their vast open expanses allow birds to feed while remaining alert for predators, and the surrounding landscape offers a welcome escape from the constant presence of humans.

For migrating shorebirds, timing is everything. Many have already flown hundreds or even thousands of miles before reaching Bonaire. Their fat reserves are depleted, and every day spent without adequate food can jeopardize the next stage of their journey. Fortunately, the salt ponds provide a nearly continuous buffet. Tiny crustaceans, aquatic insects, worms, mollusks, and other invertebrates flourish in these nutrient-rich waters, allowing shorebirds to replenish the energy needed for migration.

Bonaire’s southern Salt Ponds have been designated as part of the Western Hemisphere Shorebird Reserve Network.

The importance of this habitat has been recognized internationally. The southern salt pond area of Bonaire has been designated a site within the Western Hemisphere Shorebird Reserve Network (WHSRN), one of only three such sites in the Caribbean and Bahamas. More than 20,000 shorebirds representing 17 species visit the Pekelmeer each year. Among them are significant concentrations of Short-billed Dowitchers (Limnodromus griseus griseus/hendersoni) and the threatened rufa subspecies of Red Knot (Calidris canutus rufa).

During migration and through the winter months, Short-billed Dowitchers probe the shallow mud with their long bills in a rapid, sewing-machine motion, extracting hidden prey beneath the surface. Watching dozens of dowitchers feeding together is a reminder of how specialized these birds have become—and how dependent they are on healthy wetlands.

As spring migration gives way to summer, the avian population of the salt ponds shifts.

Terns arrive from South America, escaping that continent’s winter and spending the warmer months on Bonaire. Here they rest, feed, and produce the next generation. The salt ponds remain among their prime breeding areas on the island.

The salt ponds also host American Flamingos, Black-necked Stilts, Willets, Hudsonian Whimbrels, Black-bellied, Wilson’s, and Semipalmated Plovers, Ruddy Turnstones, various sandpipers, and numerous herons and egrets throughout the year. For many species, Bonaire is not merely a destination, but an indispensable stopover on an international migration route.

The Tropical Dry Forest: A Living Oasis

Although tropical rainforests often receive the most attention, tropical dry forests are among the world’s most threatened ecosystems. Large portions of these forests in the Caribbean and Central America have disappeared due to agriculture, grazing, and development. Bonaire’s remaining tropical dry forest therefore represents a habitat of exceptional conservation value.

At first glance, especially during the dry season, the forest can appear lifeless. Many trees shed their leaves to conserve water, while thorny shrubs dominate the landscape. Yet beneath this seemingly harsh exterior lies an ecosystem perfectly adapted to seasonal extremes. During the wet season, flowering plants produce abundant fruits and seeds that sustain resident birds as well as newly arrived migrants.

When conditions become drier, insect populations can provide an equally valuable food source for insect-eating warblers, vireos, flycatchers, and other songbirds.

Fresh water, however, remains the limiting resource. Throughout Bonaire, natural and managed watering holes become gathering places where birds of many species converge to drink and bathe. Inside and outside Washington-Slagbaai National Park, these scarce water sources become lifelines, particularly during migration, when exhausted birds must quickly replenish both energy and moisture. A morning spent quietly observing one of these watering holes can reveal an astonishing variety of life. Resident hummingbirds may dart between flowering shrubs while Bananaquits, orioles, and doves arrive to drink. During migration, colorful warblers and other North American migrants often appear alongside resident species, all sharing the same precious resource. The tropical dry forest reminds us that survival is often less about abundance than about resilience. Every tree, flowering shrub, fruiting cactus, and freshwater pond contributes to an intricate web that supports birds throughout the changing seasons.

The Mangrove Forests of Lac Bay: Nature’s Nursery

On Bonaire’s southeastern coast lies one of the island’s richest ecosystems: the mangrove forests of Lac Bay. Here, the mangroves create a maze of sheltered waterways where land and sea merge.

Mangroves are famous for protecting coastlines and serving as nurseries for fish, but they are equally valuable for birds. Their dense vegetation provides shelter from predators, protection from storms, abundant nesting opportunities, and a constant supply of food.

Unlike habitats that primarily serve one group of birds, the mangroves support remarkable diversity. Terrestrial songbirds forage among the branches while shorebirds patrol muddy edges exposed by changing tides. Herons and egrets stalk fish through shallow channels, and raptors use taller trees as hunting perches overlooking the surrounding wetlands.

Maintaining healthy mangroves requires ongoing conservation. Recent restoration efforts have focused on improving water circulation, removing accumulated sediment, and restoring natural tidal flow. These projects help ensure that the mangroves continue functioning as healthy ecosystems capable of supporting both marine life and birds for generations to come.

Birders exploring Lac Bay may encounter Green Herons, Tricolored Herons, Little Blue Herons, Great Blue Herons, Yellow-crowned Night Herons, Ospreys, Belted Kingfishers, and numerous migratory warblers using the mangroves as temporary homes during their long journeys.

The mangroves illustrate how one habitat can support an incredible variety of lifestyles simultaneously, making them one of Bonaire’s most productive natural communities.

The Rocky East Coast: Where Wind and Waves Shape Life

While Bonaire’s western coastline is calm and protected, the island’s eastern shore presents a dramatically different environment. Constant trade winds and pounding surf create a rugged coastline of limestone terraces, rocky inlets, and isolated coves that remain largely inaccessible.

For wildlife, this inaccessibility is a tremendous advantage. Many seabirds require nesting or roosting sites free from frequent human disturbance. The isolated rocky shoreline provides exactly those conditions.

Here, visiting terns can establish breeding colonies with minimal interference, increasing their chances of successfully raising young. Seabirds that do not breed on Bonaire can still find ideal conditions for roosting, gathering in colonies along the rocky shoreline at night.

The rocky coast is also surprisingly diverse beyond its shoreline. Pockets of coastal forest and shrubland offer important stopover habitat for migrating songbirds, while rocky tide pools and grassy plateaus provide feeding opportunities for shorebirds adapted to these unique conditions.

Specialized feeders such as the Yellow-crowned Night Heron take advantage of the abundant crabs inhabiting the rocky shoreline. Their sturdy bills are perfectly suited for capturing and handling crustaceans that few other herons pursue so effectively.

Offshore, seabirds patrol the turbulent waters where waves and currents concentrate schools of fish. Magnificent Frigatebirds soar effortlessly overhead, while Brown Boobies, terns, and other seabirds search for feeding opportunities created by the dynamic marine environment.

The east coast demonstrates that even harsh landscapes possess remarkable ecological value. Habitats that appear inhospitable to people have become ideal refuges for birds that depend upon isolation and natural coastal processes.

Grasslands and Agricultural Fields: Open Country Specialists

The central portion of Bonaire presents yet another landscape. Open grasslands, grazing areas, and agricultural fields may seem ordinary compared to the island’s dramatic coastlines, yet these habitats support birds that cannot thrive elsewhere.

Perhaps the most significant resident is Bonaire’s endemic subspecies of the Grasshopper Sparrow (Ammodramus savannarum caribaeus). Restricted to relatively small areas of suitable habitat, this vulnerable bird depends upon healthy native grasslands for nesting and feeding. Changes in land use, overgrazing, and habitat loss can quickly affect populations of such specialized species, making the protection of open grasslands an important conservation priority.

These grasslands also become important feeding areas for migrating shorebirds. While many people associate shorebirds exclusively with beaches and mudflats, several species prefer short grassy fields where they search for insects and other invertebrates. Seasonal rains can transform agricultural areas into productive feeding grounds during migration.

In these grassy habitats, it’s possible to see the Western Cattle Egret walking calmly among grazing donkeys or goats. This remarkable partnership benefits the birds, which capture insects disturbed by the movement of the larger animals. The relationship has allowed cattle egrets to successfully colonize landscapes around the world, and Bonaire’s grazing lands provide ideal conditions for this adaptable species.

Other birds commonly encountered in these open habitats include Groove-billed Anis, Southern Lapwings, Northern Scrub Flycatchers, Brown-crested Flycatchers, and a variety of seasonal migrants such as American Golden Plovers and Pectoral Sandpipers, depending on rainfall and habitat conditions.

The grasslands remind us that conservation is not limited to pristine wilderness. Working landscapes can also provide critical habitat when managed thoughtfully and sustainably.