Key West’s overlooked cattle egret reveals a remarkable migration story

A lone cattle egret in Key West opens a window into a remarkable migration story, from Old World origins to rapid expansion across the Americas.

 The sky over Key West was a vast blue bowl, empty of the soaring birds that usually patrol it.

Scanning the horizon one afternoon, a local birdwatcher could not spot a single turkey vulture and wondered where they had all gone. Perhaps, he mused, they had headed farther up the Florida Keys for the day, as people often do.

Seeking signs of wildlife, he drove to the park behind the dog park at Higgs Beach and stopped beside a pond that frequently attracts birds when it contains water. But deep into the dry season, the basin had become what he described as a “micro desert,” barren except for an unexpected collection of about a dozen rocks and a dozen roosters.

Nearby lies a quarter-acre plot where a Federal Aviation Administration (FAA) tower once stood. After rainfall, the fenced site often becomes a refuge for birds. Great egrets, great white herons, snowy egrets and roseate spoonbills are among the species regularly seen there.

The habitat remains attractive largely because it is enclosed by an octagonal chain-link fence and receives little maintenance.

Local rumors suggest the city or county may eventually convert the site into pickleball courts. The observer questioned the idea, noting that several courts already exist nearby. He also wondered whether the sport’s recent popularity would endure, comparing the possibility of a decline to past recreational fads such as roller disco and hacky sack.

On this visit, only a single white bird could be seen beyond the green chain-link fence.

At first glance, it appeared to be a white ibis probing the ground with a long curved bill. White ibises often thrust their bills into the soil with rapid, repetitive movements resembling the pumping action of an oil derrick.

But when the bird finally raised its head, the identification changed.

Rather than the long curved bill of an ibis, the bird had a shorter wedge-shaped bill. It was not a white ibis at all but a cattle egret.

The bird wandered through the dry grass, frequently bobbing its head. At times it moved quickly in a more upright posture reminiscent of a duck. Every so often it thrust its face into the grass stubble, apparently searching for food.

Herons and egrets typically capture prey with the tips of their bills before tossing their heads backward to guide the catch toward their throats. Sometimes the maneuver succeeds immediately while at other times it takes several attempts.

The observer recalled one particularly dramatic example near the bridge over Riviera Canal where a great blue heron captured a small snake. The snake repeatedly wrapped itself around the bird’s bill as the heron attempted to swallow it. Each time the heron shook the reptile loose and swallowed another inch or two before the snake coiled around the bill again. The struggle continued for a considerable time before ending in the bird’s favor.

The cattle egret behind the fence showed plenty of probing behavior but little visible head-flinging. The observer hoped the bird was nevertheless finding food, perhaps tiny insects that could be swallowed almost unnoticed.

Curious about a species he admitted largely overlooking, he decided to watch longer. Although he had previously photographed cattle egrets carrying worms and insects, he wanted to see what prey this individual might catch.

Despite being common across much of the United States, cattle egrets are not frequently encountered in the Florida Keys.

Using his vehicle as a makeshift blind, he parked near the fence and attempted to photograph the bird through openings in the chain link. The camera managed to focus through the gaps only about one-third of the time, often leaving a soft crosshatched pattern in the foreground of the images.

He did observe the bird toss its head back several times, but unfortunately not while looking through binoculars or a camera lens.

Part of the reason, he said, for paying little attention to cattle egrets is that they appear less dramatic than many members of the Ardea family, which includes herons and egrets. Yet the species stands apart from many of its relatives in several respects.

Like most herons and egrets, cattle egrets are monomorphic, meaning males and females appear virtually identical to human observers.

Their plumage is predominantly white, though during breeding season they develop pale brown patches resembling the color of weak tea. The bird observed in Key West displayed brown coloration on the crown of its head.

Compared with many relatives, cattle egrets have thicker bodies, shorter necks and somewhat stubbier legs.

They also differ in habitat preferences. While many members of the Ardea family nest near bays, lakes and creeks, cattle egrets appear less dependent on water. They may breed near wetlands but are equally comfortable in upland environments.

Their common name reflects their well-known association with livestock. The birds often forage around cattle, searching for prey in hoofprints left by the animals.

Remarkably, cattle egrets were unknown in North America only about 85 years ago.

The species originated in the Old World and was first recorded in the Americas in Guyana in 1930. Early speculation suggested that laborers from India, where cattle egrets are common, had brought the birds as pets. That theory was later dismissed after researchers determined the Guyana birds belonged to a different species from those found in India.

Scientists now generally believe the birds reached South America on their own before gradually expanding their range.

The first known cattle egrets in North America were observed near Lake Okeechobee in Florida by biologist Willard E. Dilley. He later recalled seeing them sometime between January 1941, when he moved to Clewiston, and the summer of 1943, when he left to serve in the U.S. Navy during World War II.

The birds were reported again around Lake Okeechobee in about 1946.

From there, cattle egrets rapidly expanded across the southern United States and beyond. During the 1950s, they appeared in New Jersey, Massachusetts, Virginia, Maine and Long Island, New York.

Much of this historical account comes from a 1954 paper written by Sandy Sprunt Jr., longtime head of the Audubon Tavernier Science Center.

The report also documented one of the earliest sightings of cattle egrets in Key West.

According to the paper, four cattle egrets were observed on November 8, 1953, by renowned local birder Frances Hames, who served as the area’s leading birdwatching authority from the 1940s through the late 1970s.

Hames was known for an unusual episode in which military police briefly arrested her while she was birdwatching on Boca Chica, mistakenly suspecting her of espionage.

Reflecting on her 1953 sighting, Hames wrote: “I had not expected to see the cattle egret here because he is supposed to be a bird of ‘open cultivated country’ and not of the mangroves and mudflats along the coast.”

The following video is in Bangla: