Colombo, December 25: One of the endearing sights in Sri Lanka’s capital city is the way in which man and nature coexist. In the following series of pictures, Xinhua’s Tang Lu captures pelicans from Beira Lake nonchalantly flying over traffic and watching people as they scurry to their work places on a typical morning in downtown Colombo.
Some facts about the pelican as stated by Mark Mancini in www.mentalfloss.com
The earliest pelican fossil on record is a 30-million-year-old skull that was found in the Oligocene deposits of France. Paleontologists have also uncovered younger material from places like Germany, India, Kenya, Peru, Australia, and North Carolina. Today, there are eight living species and you can find some combination of them dwelling on every continent except Antarctica.
THEY DON’T STORE FOOD IN THE POUCH ON THEIR BILLS.
The large, fibrous skin pouch that dangles from a pelican’s bill is called the gular pouch (or, occasionally, the gular sac). Many people mistakenly believe it’s used to store food, like a built-in lunch box. The idea was popularized by a limerick of unknown authorship:
“A wonderful bird is the pelican.
His beak can hold more than his belly can.
He can hold in his beak enough food for a week.
But I’ll be damned if I can see how the helican.”
While the rhyme is amusing, it isn’t accurate. In reality, pelicans use their gular pouches as a means of capturing food—not as a place to keep it tucked away for extended periods. The highly-flexible sacs can expand or contract, and the lower jaw bones they’re connected to are capable of bowing outwards, which enables the birds to use their sacs as fishing nets. Once a pelican captures its prey, the bird drains any water it may have accidentally captured with it by tilting its head and contracting those pouch muscles. (Fun fact: Some species can hold three gallons’ worth of liquid in their gular sacs.) Usually, the prey is swallowed immediately after the water purge.
PELICANS DON’T JUST EAT FISH.
In 2006, Londoners were shocked when a pigeon was swallowed whole by a great white pelican in front of some horrified kids at St. James’s Park. Attacks like that aren’t unusual: Although pelicans specialize in eating fish, they also prey on crustaceans, amphibians, turtles, and—yes—other birds. If it can fit down their throats, it’s fair game.
TWO SPECIES PLUNGE-DIVE FOR FOOD.
The brown pelican is a keen-eyed predator that can spot a fish swimming under the ocean’s surface even while flying 60 feet above. Its bigger cousin, the Peruvian pelican, also has great vision. Once a target has been spotted from above, the pelicans plunge into the sea bill-first at high speeds—and often from a height of several stories. When they collide with the prey, the impact force usually stuns the victim and it’s then scooped up in the gular pouch.
It’s a dangerous stunt, but pelicans have numerous adaptations that keep them from injuring themselves when they smack into the water. To keep their neck vertebrae from getting broken, they stiffen the surrounding muscles as they dive; by throwing their wings straight backwards, pelicans can avoid fracturing any of the bones in the appendages on the unforgiving waves. Air sacs under the skin around their neck and breast area inflate before the bird hits the water’s surface, and the gular pouch behaves like an air bag: the instant a bird’s jaws are thrown open under the water, its forward momentum is slowed. Good form takes practice. Young brown and Peruvian pelicans struggle with their marksmanship at first, but over time, they get better at successfully dive-bombing fish.
SOME HUNT IN GROUPS.
Most pelicans don’t dive bomb their prey; they scoop it up while treading along on the water’s surface. To increase their chances of success, the birds occasionally form hunting parties, gathering in a U-shape and beating their wings on the water to corral fish into a tight cluster—or drive them into the shallows.
THE AMERICAN WHITE PELICAN GROWS A TEMPORARY “HORN.”
An impressive bird indigenous to North America, this pelican stands around 4 feet tall and sports a 9-foot wingspan. Every year, something weird happens to the adults. Breeding season for American white pelicans lasts from late March to early May. When it arrives, a broad, flat, yellow or orange “horn” appears on the upper bills of sexually mature birds (both male and female). At some point in May, the fibrous structures fall off, to be replaced with brand new ones the following season.
ALL FOUR OF A PELICAN’S TOES ARE UNITED BY WEBBING.
Water birds tend to have four toes on each foot along with some degree of webbing. But in geese and ducks, the webbing is only present between the three toes that point forward. None is connected to the fourth toe, which—in the aforementioned species—is small and oriented in the opposite direction. Pelicans are different. They have totipalmate feet, which means that on each foot, there’s webbing that connects all four toes. Other birds with this kind of arrangement include cormorants, gannets, and boobies.
THEY PLAYED A SURPRISING ROLE IN THE HISTORY OF CHRISTIAN ART.
In medieval Europe, it was believed that whenever food grew scarce, mother pelicans would intentionally stab themselves on the breast with their beaks and then use the blood to feed their chicks. It’s a noble idea, but it’s a myth that probably has something to do with the gular pouches of Dalmatian pelicans, which turn an orang-reddish color during the breeding season. Maybe an onlooker saw one preening and got the wrong idea. Regardless, the myth of bloodletting pelicans struck a chord with Christian artists, who compared the gesture to the sacrifice Jesus made on humanity’s behalf. Thus, the motif became widespread in Europe during the late medieval and early Renaissance periods. A 1611 edition of the King James Bible featured the image of a breast-piercing pelican. The symbol also appears in a 1575 portrait of Queen Elizabeth I.
THEY’RE MOUTH-BREATHERS.
Pelicans technically have nasal openings. However, in all eight species, the nostrils are sealed off, buried under the beak’s horny sheath. This doesn’t mean that the cavities are functionless, though: The hidden nostrils house special glands which remove excess salt from the blood stream. Since pelicans and other maritime birds ingest sea water to survive, this trait is a real life-saver. Because their nostrils are walled-off and clogged up by desalinizing glands, it should come as no surprise that pelicans predominantly breathe through their mouths.
BROWN PELICANS HAVE MADE A REMARKABLE COMEBACK OVER THE PAST 50 YEARS.
The insecticide known as DDT, which rose to prominence during the 1950s and 1960s, infested whole food chains. After it was sprayed on crops, it was consumed by earthworms, and run-off ensured fish got a dose, too. In turn, these animals were transferring the substance to the various birds that ate them. Although DDT didn’t kill many avians directly, it did have a knack for weakening their egg shells. As a result, the populations of many beloved species—including bald eagles, peregrine falcons, and brown pelicans—took a hit, and the brown pelican all but vanished in vast swaths of the country.
A 1938 census had counted 5000 breeding pairs of brown pelicans in Louisiana. But in 1963, not a single brown pelican sighting was recorded within the state. Texas birders observed similar declines. While early declines were caused by hunters and fishermen, these later declines were pinned on industrial pollutants and insecticides like DDT. Then, a badly-needed break came when public outrage drove the Environmental Protection Agency to ban DDT in 1972. Since that time, the brown pelican has reversed its once-gloomy fortunes. Reintroduction campaigns helped the birds bounce back in Louisiana, Texas, and elsewhere. The brown pelican was listed as endangered in 1970, but in 1985, brown pelicans in a few southern states were removed from the list. Then in 2009, the species was taken off the list entirely.
A VANISHING SPECIES IN SRI LANKA
According to Kanchana Weeracoon Ranasinge, the Spot Billed Pelican (Pelecanus philippensis) is one of the important bird species categorized as vulnerable and the only known present day breeding populations occur in Sri Lanka, India and Cambodia (Threatened birds of Asia, the Birdlife International Red Data Book).
According to the Asian Red data book, this species in Sri Lanka is under threat due to the loss of habitat, disturbances to breeding sites, cutting of mangroves and excessive fishing and hunting. We have also gathered reliable data on hunting of this species. This practice is due to ignorance, as they have not had adequate information on the bird. There are some field records of Spot Billed Pelican in Central (CP) and North Central provinces (NCP) of Sri Lanka but no systematic study has been carried out.
A strong awareness program for the local community including fishermen, farmers, people who are involved in aquaculture projects and other community members is important to mitigate some of the threats and ultimately to find solutions to conserve this bird species.
(The featured image at the top shows pelicans from Beira Lake watching daybreak from their perches atop lamp posts in downtown Colombo. Photo: Tang Lu/Xinhua. Text added by newsin.asia)
