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Pelican

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Pelicans are a genus of large water birds belonging to the family Pelecanidae.

Pelicans at National Zoo
Pelicans at National Zoo

They are famous for their specialized anatomy, which allows them to thrive in various aquatic environments. These birds are characterized by long bills and a massive throat pouch known as a gular pouch. This pouch is attached to the lower mandible and functions like a flexible basket. Pelicans use this tool to scoop up prey, such as fish, and to drain excess water before swallowing.

Pelican-Gaping-Aruba
Pelican-Gaping-Aruba

Because they are among the heaviest flying birds, they have evolved unique physical traits to manage their weight. Air pockets located within their skeleton and beneath their skin help them remain buoyant. This allows them to float high on the water's surface with ease.

The feeding mechanism of a pelican is a highly efficient biological process.

When hunting, many species dive into the water or scoop from the surface. The slender rami of the lower bill and flexible tongue muscles allow the gular pouch to expand. This expansion creates a large volume to capture fish and even rainwater. To ensure they can swallow large prey without obstruction, the pelican's tongue remains quite small. Once the prey is captured, the bird tilts its head to drain the water from the pouch. Only after the water is removed does the bird swallow its meal.

There are eight living species of pelicans, which can be categorized by plumage and nesting habits.

Mikebaird - American White Pelican (Pelecanus erythrorhynchos ) (bird) in Mo (by)
Mikebaird - American White Pelican (Pelecanus erythrorhynchos ) (bird) in Mo (by)

Historically, researchers divided them into two groups based on appearance. One group consists of four species with white plumage that nest on the ground. These include the Australian, Dalmatian, great white, and American white pelicans. The second group includes four species with grey or brown plumage. These species, such as the brown and Peruvian pelicans, typically nest in trees or on coastal rocks.

However, modern genetic analysis shows that these traits do not represent deep evolutionary splits. Instead, DNA reveals two major lineages: a New World clade and an Old World clade.

The evolutionary history of pelicans is supported by a significant fossil record.

Pelicans at National Zoo
Pelicans at National Zoo

The oldest known fossil is named Eopelecanus aegyptiacus, found in Egypt. This specimen is a tibiotarsus, which is a bone from the lower leg, dating back approximately 36 million years to the late Eocene. This fossil shows a striking similarity to the birds we see today. Scientists believe pelicans evolved in the Old World and later spread into the Americas. This migration is reflected in the genetic split between the Old World and New World lineages. The remarkable similarity between ancient and modern beaks suggests that their feeding design has remained optimal for millions of years.

Taxonomy, or the science of naming and classifying life, has changed significantly for pelicans.

The genus Pelecanus was first formally described by Carl Linnaeus in 1758. He identified their straight bills, hooked tips, and fully webbed feet as key traits. The family Pelecanidae was later named by Constantine Samuel Rafinesque in 1815. Pelicans belong to the order Pelecaniformes, a group that has undergone many revisions. While birds like cormorants and frigatebirds were once included, they have since been moved to different orders. Today, the order Pelecaniformes includes herons, ibises, spoonbills, the hamerkop, and the shoebill.

Pelicans have a global but patchy distribution, ranging from tropical to temperate zones.

Australian Pelican showing large pouch
Australian Pelican showing large pouch

They are often found in maritime and coastal zones, but they can adapt to different water types. They can live in freshwater, seawater, or brackish water, which is a mix of both. Some species even travel far inland. For example, white pelicans have been seen at the Great Salt Lake in Utah, about 600 miles from the coast.

Pelecanus erythrorhynchos -Tulsa Zoo, Oklahoma, USA-8c
Pelecanus erythrorhynchos -Tulsa Zoo, Oklahoma, USA-8c

Other species may migrate to inland deserts following heavy rains that create temporary lakes. This flexibility allows them to inhabit diverse ecosystems across the globe.

Despite their biological success, pelicans face various challenges in the modern world.

Spot-billed pelican-02
Spot-billed pelican-02

They are gregarious birds, meaning they are highly social and live in groups. They travel in flocks, hunt cooperatively, and breed in large colonies. However, their relationship with humans can be difficult. They are sometimes persecuted because people believe they compete with commercial and recreational fishers. Habitat destruction, environmental pollution, and human disturbance have also caused populations to fall. Currently, three species are considered to be of conservation concern. Protecting their habitats is essential for the continued survival of these remarkable birds.

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🖼️ Images & Media (26)
File:Pelicans at National Zoo.jpg
Pelicans at National Zoo.jpg
File:Mikebaird - American White Pelican (Pelecanus erythrorhynchos ) (bird) in Mo (by).jpg
Mikebaird - American White Pelican...
File:Pelecanus Occidentalis KW 1.JPG
Pelecanus Occidentalis KW 1.JPG
File:Pelícano en Pucusana.JPG
Pelícano en Pucusana.JPG
File:Whitepelican edit shadowlift edit.jpg
Whitepelican edit shadowlift edit.jpg
File:Pelecanus conspicillatus -Australia -8.jpg
Pelecanus conspicillatus -Australia -8.jpg
File:Pink-backed Pelican - Naivasha - Kenya 50276 (15205474549).jpg
Pink-backed Pelican - Naivasha - Kenya...
File:Dalmatian Pelican RWD2.jpg
Dalmatian Pelican RWD2.jpg
File:Spot-billed pelican-02.jpg
Spot-billed pelican-02.jpg
File:Pelican-Gaping-Aruba.JPG
Pelican-Gaping-Aruba.JPG
File:Pelecanus erythrorhynchos -Tulsa Zoo, Oklahoma, USA-8c.jpg
Pelecanus erythrorhynchos -Tulsa Zoo,...
File:Pelecanus occidentalis -Smith Island, Chesapeake Bay, Maryland, USA -nest-8cr.jpg
Pelecanus occidentalis -Smith Island,...

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