Showing posts with label water birds. Show all posts
Showing posts with label water birds. Show all posts

Heron


The heron is a large species of bird that inhabits wetlands and areas that are close to lakes, ponds and rivers. Some species of heron are also known as egrets and bitterns instead of being called herons.There are 64 different species of heron found inhabiting the wetlands around the world. Herons are commonly found in Europe and North America along with the more temperate regions of Africa, Asia and Australia. Herons are commonly confused with the stalk which is another large species of bird, however the fact that herons fly with their necks in rather than outstretched is on the main differences between herons and stalks.
The great blue heron found inhabiting parts of North America and as far west as the Galapagos Islands is the largest species of heron in the world and can measure nearly a meter in height. The smallest species of heron in the world is the green heron measuring less than 50 cm tall. The green heron is most commonly found in North America and Central America, and occasionally in Hawaii.
All 64 different species of heron are very similar in body shape but not in size and colour. All herons have long pointed beaks which helps them to grab fish out of the water, along with long necks and thin, long legs both of which are useful to the heron as it lives it's waterside lifestyle. Herons also have enormous wings that can be nearly double the size of the heron's body.
The heron is a carnivorous species of bird, with the heron primarily feeding on fish. Herons also prey on a number of other small animals including amphibians, molluscs, snakes, insects and even small mammals and birds. The heron uses it's long pointed beak to snatch it's prey out of the water or from the ground.
Due to their large size, herons have few natural predators in their wetland environment. Foxes, raccoons, minks and weasels are the herons most common predators as they predominately prey on the eggs of the heron and their young rather than the adult heron itself.
Some species of heron are known to breed in colonies but most heron species breed on their own usually in woodland close to water. Herons build their nests in tall trees so that the eggs are safe from the predators on the ground. The nest of the heron is build out try leaves and twigs by both the male heron and the female heron. The female heron lays an average of 4 eggs per clutch which hatch after an incubation period of around 1 month. Both the male heron and the female heron help to incubate their eggs and feed the tiny heron chicks. Herons live for up to 25 years.
Herons are not considered to be threatened or endangered animals although concerns have been raised about the health-risks to the world's heron populations. Pollution is a major factor in the decline of many animal populations around the world, and pollution in the water can have a devastating effect on the fish which the heron eat. 

Heron Facts

Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Ciconiiformes
Family: Ardeidae
Scientific Name: Ardeidae
Type: Bird
Diet: Carnivore
Size (H): 85cm - 140cm (34in - 55in)
Wing Span: 150cm - 195cm (60in - 77in)
Weight: 1.5kg - 3kg (3.3lbs - 6.6lbs)
Top Speed: 64km/h (40mph)
Life Span: 15 - 20 years
Lifestyle: Solitary
Conservation Status: Least Concern
Colour: Brown, Black, White, Grey
Skin Type: Feathers
Favourite Food: Fish
Habitat: Wetland regions
Average Clutch Size: 4
Main Prey: Fish, Insects, Molluscs
Predators: Fox, Mink, Raccoon
Distinctive Features: Long thin legs and pointed beak

African Fish Eagle (Haliaeetus vocifer)


The African Fish Eagle or as it is scientifically known,Haliaeetus vocifer, can be seen throughout Southern Africa and is known by many varieties of names, in many languages. This includes the River eagle, Aigle pecheur, Pygargue vocifer, Afrikaanse visarend and so on. This fairly large bird is related to the North American Bald Eagle and can be easily identified by the distinct black, brown body and white head and tail. The length of the African Fish Eagle varies between 63 and 75 cm.
The Fish Eagles habitat is limited to mainly lakes, large rivers, pans and dams with surrounding trees for it to perch on. They can also be found near estuaries and coastal lagoons but are rarely spotted in the southwestern parts of Africa and areas on the eastern part of Somalia because the land is so arid. The African Fish Eagle makes its nest out of large piles of sticks, 30 to 60 cm deep and 120 to 180 cm in diameter. The nest is built usually near water at the fork of a tree, sometimes on a cliff ledge or on a steep slope on a low slope.
The beautiful and distinct call of the African Fish Eagle is synonymous with the sound of Africa and is very similar to the American Bald Eagle. There are two specific calls, the one is in flight and the other is when it is perched. When the male fish eagle nears the nest it makes a kind of mellow ‘quock’ sound where as the female has a more of a shriller sound.
The African Fish Eagle pairs up whether it is in or out of mating season, which goes from March to September. The pairs even go as far as sharing any kills that they make between the two of them. The African Fish Eagle is known as a kleptoparasite, which means that it will steal prey from another bird, like the Goliath Heron who loses a lot of its catch to Fish Eagles. They will also take advantage of nesting water birds for their eggs and young.
The main diet of the Fish Eagle is fish that they catch and occasionally when it is dead. They can catch a fish that weighs up to 1 kg in weight and now and again up to 3 kg’s. If the fish weighs more then two and a half kilograms the eagle will not carry it in flight but will plane it along the waters surface to shore. Fish eagles mainly catch lungfish and catfish and in some places will feed off flamingos and other water birds if the occasion presents itself. It has been known to eat dead animals and on very rare occasions they will even feed off monkeys, insects, frogs, dassies and so on. The hunt begins when the eagle leaves its perch to stoop and catch its prey with its feet about 15 cm from the waters surface. It’s not often that the African Fish Eagle will catch prey in the sky or submerge itself in the water.