Pelecanus conspicillatus
Australian pelican

Australian pelicans (Pelecanus conspicillatus) are native to Australia, Indonesia, Papua New Guinea, Solomon Islands, and Timor-Leste and vagrant to Fiji, Nauru, New Caledonia, New Zealand, Palau, and Vanuatu. ("BirdLife International", 2010)

Australian pelicans live very close to water in coastal inlets, shorelines, lakes, swamps and rivers of the interior. They will reside in almost any area that supports a large abundance of fish, but their major habitat is the marine intertidal zone including sandy shoreline, sandbars and spits. ("BirdLife International", 2010)

Australian pelicans are one of the largest flying birds. They feature a wingspan of 2.3 to 2.5 m and can weigh from 4 to 6.8 kg. They have the longest bill length of any extant bird ranging from 36 to cm. The average bill length of males is between 42 and 46 cm and in females from 36 to 41 cm. Between the bones on the lower bill is a stretchy patch of skin called the gular pouch. The gular pouch will stretch when it is filled with water and can hold up to three gallons. Pelicans also have a large nail on the tip of the upper part of the bill. They have short legs and large feet with webbing between all four toes.

Non-breeding adults have primarily white plumage. The lower back, primary wing feathers are all black. These pelicans have dark brown eyes. The bill is light pink, as is the gular pouch. The beak can also feature a dark blue stripe and the nail on the tip of the bill is yellow to orange. Their legs, feet and webbing are grey to blue-grey.

Juvenile Australian pelicans are primarily brown in color. The plumage on the head can vary from white to brown. The bill and the gular pouch are a light pink in color. Unlike non-breeding adult Australian pelicans the feet and legs are brownish grey in color instead of blueish grey.

Sexual dimorphism in this species only applies to size not plumage. Males are larger than females, but the plumage in both sexes is identical. (Christie, 2003; Johnsgard, 1993; Vestjens, 1997)

Australian pelicans breed in large colonies, usually on islands or inland where there are few predators. Pelicans are seasonally monogamous, meaning that every breeding season they pair up with a mate and then stay with that mate for the rest of the season. The following breeding season they may or may not be with the same mate.

Courtship occurs when the local breeding population gathers at the breeding site. The large group breaks away into smaller groups consisting of a single female and two or more males. Within these smaller groups, males compete against one another for the attention of the female. Females lead the males in her group on courtship walks, swims, and flights, all the while the males display for her. The subordinate males will slowly break away and join other groups. Generally by the end of the ritual, only one male will remain. The pair will then land and begin designating a nesting site.

While the female pelican sits on the nest site, the male will perform a ritualistic display which may be followed with copulation. In order to mate the male must get on the female's back and then copulation will last from 6 to 22 seconds. They will mate several times over several hours. In between copulations the male will stand next to the female while she starts building the nest. Only after several copulations will the couple begin foraging for nest materials away from the nest. (Johnsgard, 1993; Vestjens, 1997)

Breeding usually occurs in winter or early spring, but may occur at any point in the year. Timing of breeding season is dependent upon rainfall and usually after rain events.

Australian pelicans lay approximately two, 172.9 g eggs per season, but clutch size can vary from 1 to 3. The eggs are elliptical in shape and range from 90 by 59 mm in size. Incubation lasts 32 to 35 days. At the time of hatching birds are altricial, feather-less and with eyes closed. In multi-egg nests, often one chick out-competes the others and is the sole survivor. After chicks leave the nest, they join large groups of up to 100 chicks also known as 'creches'. Chicks remain in these groups until they reach 2 months of age and are able to fly. Chicks do not reach independence for four months after hatching, when the parents stop regular feeding. Juvenile Australian pelicans reach sexual maturity at 3 to 4 years old. (Johnsgard, 1993; Vestjens, 1997)

After pairs court and mate they then share the responsibilities of nest building, incubation, and feeding their offspring. During nest building both parents collect materials for the nest. Females will remain at the nesting site collecting nearby materials and forming a ground scrape, while the males will fly away as far as a mile to find materials for the nest.

After the eggs are laid, both parents share incubation responsibilities. Parents incubate by cradling the eggs on their feet. After hatching both parents alternate hunting for food. After 25 days chicks leave the nest and form creches and parents are able to leave the chicks alone for extended periods of time.

Australian pelican parents feed their young up to the first four months of the chick’s life. While still in the nest, chicks feed whenever they are hungry. When the chick leaves the nest to join a creche, they will only return to the nest when parents return to feed the chick After feeding, the chick will return to its creche. As the chick gets older the parents will feed their young on the edge of the creche. Once the chick becomes even larger it will leave the creche and join its parents some distance away to be fed. (Johnsgard, 1993; Vestjens, 1997)

Typically pelicans live between 15 and 25 years in the wild. Pelicans can live longer in captivity; the longest-lived captive Australian pelican was 50 years old. (Beletsky, 2006)

Australian pelicans are highly social, diurnal birds that fly together in groups which can be very large at times. They breed in large colonies of up to 40,000 individuals. They are strong, slow fliers that often glide on thermals to conserve energy. During flight they pull their head inward towards their body and rest it on their shoulders. These birds will travel very long distances in order to find food, and have been known to remain airborne for 24 hours. (Christie, 2003; Johnsgard, 1993)

P. conspicillatus are nomadic birds with a very large range. ("BirdLife International", 2010)

Adult pelicans have few calls and they rarely use them. Their calls include hissing, blowing, groaning, grunting, or bill-clattering. The young are much more vocal than the adults and will loudly beg for food. Australian pelicans primarily communicate with visual cues using their wings, necks, bills, and pouches, especially in courtship displays. Like all birds, Australian pelicans perceive their environment through visual, auditory, tactile, and chemical stimuli. (Christie, 2003; Johnsgard, 1993; Vestjens, 1997)

Fish is the main bulk of Australian pelicans' diet. They also have been known to eat prawns, amphibians, small reptiles and small mammals. These pelicans eat fish that are between 60 to 247 mm long and weigh 17 to 320 grams. Crustaceans make up a minor part of the diet, but it includes freshwater crayfish and shrimp.

Australian pelicans feed by primarily using a bill thrusting technique commonly used in other pelican species. This technique consists of tipping forward and thrusting their bill underwater to grab fish or other food items. Other times Australian pelicans will scoop the food up with their bills from shallow waters or while swimming and even when they are flying low over the surface of the water. Every so often this species is reported being seen plunging into the water from a meter or so in the air. When flocks group together to forage they corral the fish into shallow or confined areas so that they can be easily captured. Australian pelicans have been described as an opportunistic feeder meaning they will scavenge and even pirate food from other animals. In times of scarce food resources, they will even eat the young of gulls and ducklings. (Johnsgard, 1993; Smith and Munro, 2008; Vestjens, 1997)

Australian pelicans have very few predators, but within ground-nesting breeding colonies the chicks are vulnerable. Australian ravens are common predators of Australian pelican chicks. As are certain mammalian predators such as domestic dogs. Another threat to chicks are courting adults. They will move through the colony and accidentally crush eggs and destroy nests.

Australian pelican chicks' primary anti-predator defense is their formation of creches. These groups can reach sizes of 100 individuals, which may deter predation by numbers alone. (Johnsgard, 1993; Smith and Munro, 2008; Vestjens, 1997)

Australian pelicans play a role in dispersing plant species across their habitat. They eat fish that eat vegetation in one area. Then when the pelican moves on to another location the plant propagules are transplanted to the new location through the pelican's feces. This allows for the movement of plant species and also recolonization of plant-lacking wetlands. This dispersal can also be problematic because this may allow for the invasion and spread of exotic plant species. (Green, et al., 2008)

Several species of nematodes (Contracaecum pyripapillatum and Contracaecum multipapillatum) use Australian pelicans as hosts. (Shamsi, et al., 2008)

Pelicans have been symbols of mutual aid and love of fellow human beings. Pelican guano is also used in fertilizer, which can be very beneficial to agricultural economies. Australian pelicans in particular have no significant impact on human beings. (Christie, 2003)

Australian pelicans can be habituated to human activity quite easily. This can be problematic for humans because these pelicans will directly approach humans to be fed or steal from humans because they are opportunistic feeders. This is also problematic because they get caught on fishing lines and hooks, thus disrupting fishermen's catch. (Christie, 2003)

Australian pelicans are of least concern because they have a very large range, their population trend is fluctuating, and their population size is very large (between 100,000 and 1,000,000 individuals). ("IUCN", 2009)