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Rhea americana

 

 

The native range of this flightless bird is the eastern part of South America; it is not only the largest species of the genus Rhea but also the largest American bird alive. It is also notable for its reproductive habits, and for the fact that a group has established itself in Germany in recent years.

 

The adults have an average weight of 20–27 kg (44–60 lb) and 129 cm (51 in) long from beak to tail; they usually stand about 1.50 m (5 ft) tall. The males are generally bigger than the females, males can weigh up to 40 kilograms (88 lb) and measure over 150 cm (59 in) long. The legs are long and strong, and have three toes. The wings of the American Rhea are rather long; the birds use them during running to maintain balance during tight turns.

 

Greater Rheas have a fluffy, tattered-looking plumage. The feathers are gray or brown, with high individual variation, In general, males are darker than females. Even in the wild – particularly in Argentina – leucistic individuals (with white body plumage and blue eyes) as well as albinos occur. Hatchling Greater Rheas are grey with dark lengthwise stripes.The bulk of its food consists of broad-leaved dicot foilage and other plantstuffs, particularly seed and fruit when in season.Like many birds which feed on tough plant matter, the Greater Rhea swallows pebbles which help grind down the food for easy digestion. It is much attracted to sparkling objects and sometimes accidentially swallows metallic or glossy objects.Greater Rheas breed in the warmer months, between August and January depending on the climate. Males are simultaneously polygynous, females are serially polyandrous.

 

In practice, this means that the females move around during breeding season, mating with a male and depositing their eggs with the male before leaving him and mating with another male. Males on the other hand are sedentary, attending the nests and taking care of incubation and the hatchlings all on their own. Although recent evidence suggest that dominant males may enlist a subordinate male to roost for him while he starts a second nest with a second harem.

 

This species is farmed in North America and Europe similar to the Emu and Ostrich. The main products are meat and eggs, but rhea oil is used for cosmetics and soaps and rhea leather is also traded in quantity. Male Greater Rheas are very territorial during the breeding season.

 

Herring Gull

 

 

The Herring Gull, Larus argentatus, is a large gull (up to 26 inches or 66 cm long), and is the most abundant and best known of all gulls along the shores of Asia, western Europe, and North America. It breeds across North America, Europe and Asia. Some Herring Gulls, especially those resident in colder areas, migrate further south in winter, but many are permanent residents, e.g. those on the lower Great Lakes, on the east coast of North America or at the North Sea shores. Herring Gulls are also abundant around inland garbage dumps, and some have even adapted to life in inland cities.

 

The average Herring Gull is 55-66 cm (22-26 inches) long with a wingspan of 138-150 cm. Adults in breeding plumage have a grey back and upperwings and white head and underparts. The wingtips are black with white spots known as "mirrors" . The bill is yellow with a red spot and there is a ring of bare yellow skin around the pale eye. The legs are normally pink at all ages but can be yellowish, particularly in the Baltic population which was formerly regarded as a separate subspecies "L. a. omissus". Non-breeding adults have brown streaks on the head and neck. Male and female plumage is identical at all stages of development, however adult males are often larger.

 

The loud laughing call is well-known in the northern hemisphere. The Herring Gull also has a yelping alarm call and a low barking anxiety call. Herring Gull chicks and fledglings emit a distinctive, repetitive high-pitched 'peep', accompanied by a head-flicking gesture when begging for food from, or calling to their parents. It should also be noted that adult gulls in urban areas will also exhibit this behaviour when fed by humans.

 

Herring Gull flocks have a loose pecking order, based on size, aggressiveness and physical strength. Communication between these birds is complex and highly-developed - employing both calls and body language. Two identical vocalizations can have very different (sometimes opposite) meanings, for example - depending on the positionings of the head, body, wings and tail relative to each other and the ground in the calling gull. Herring Gulls are known to be capable of seeing ultraviolet light.

 

Two to four eggs, usually three, are laid on the ground or cliff ledges in colonies, and are defended vigorously by this large gull. The eggs are a dark blotched, olive color. They are incubated for 28-30 days.Like most gulls, Herring Gulls are long lived, with a maximum age of 49 years recorded.

 

 

Condor

 

 

 

Condor is the name for two species of New World vultures, each in a monotypic genus. They are the largest flying land birds in the Western Hemisphere.

They are:

* The Andean Condor (Vultur gryphus) which inhabits the Andean mountains.
* The California Condor (Gymnogyps californianus) nowadays restricted to western coastal mountains of the United States.

They both are carrion-eaters and have distinctive bare heads.

 

Both condors are very large broad-winged soaring birds, the Andean Condor being 5 cm shorter (beak to tail) on average than the northern species, but larger in wingspan. California Condors are the largest flying land birds in North America.

 

The adult plumage is uniformly black, with the exception of a frill of white feathers nearly surrounding the base of the neck and, especially in the male, large effects of dehydration and ultraviolet light at high altitudes, and are meticulously kept clean by the bird. The head is much flattened above. In the male it is crowned with a caruncle or comb, while the skin of the neck in the male lies in folds, forming a wattle. The skin of the head and neck is capable of flushing noticeably in response to emotional state, which serves to communicate between individuals.

 

The middle toe is greatly elongated, and the hinder one but slightly developed, while the talons of all the toes are comparatively straight and blunt. The feet are thus more adapted to walking as in their relatives the storks, and of little use as weapons or organs of prehension as in birds of prey and Old World vultures. The female, contrary to the usual rule among birds of prey, is smaller than the male.Sexual maturity and breeding behavior do not appear in the condor until 5 or 6 years of age. They may live for 50 years or more, and mate for life. One captive bird lived for 77 years.

 

Wild condors inhabit large territories, often traveling 250 km (150 miles ) a day in search of carrion. They prefer large carcasses such as deer or cattle which they spot by looking for other scavengers, which cannot rip through the tougher hides of these larger animals with the efficiency of the larger condor. In the wild they are intermittent eaters, often going for a few days without eating, then gorging themselves on several kilograms at once, sometimes to the point of being unable to lift off the ground.

 

Buzzard

 

 

The Common Buzzard (Buteo buteo) is a medium to large bird of prey, whose range covers most of Europe and extends into Asia. It is typically between 51-57 cm in length with a 110 to 130 cm (48-60 inch) wingspan, making it a medium-sized raptor. There are around 40,000 breeding pairs in Britain. It is usually resident all year except in the coldest parts of its range, and in the case of one subspecies.

 

It breeds in woodland, usually on the fringes, but favours hunting over open land. It eats mainly small mammals, and will come to carrion. A great opportunist, it adapts well to a varied diet of pheasant, rabbit, other small mammals, snakes & lizards & can often be seen walking over recently ploughed fields looking for worms & insects.This broad-winged raptor has a wide variety of plumages, and in Europe can be confused with the similar Rough-legged Buzzard (Buteo lagopus) and the only distantly related Honey Buzzard (Pernis apivorus), which mimics the Common Buzzard's plumage for a degree of protection from Goshawks. The plumage can vary in Britain from almost pure white to black, but is usually shades of brown, with a pale 'necklace' of feathers.

 

There are many types of buzzards. The most common are::

1) Forest Buzzard

2) Steppe Buzzard etc.,

 

The Forest Buzzard, is another form sometimes upgraded to a full species. This is a resident breeding species in woodlands in southern and eastern South Africa. It is very similar to the abundant summer migrant Steppe Buzzard, but the adult can be distinguished with a good view by its whiter underparts and unbarred flanks. The Juvenile differs from the same-age Steppe Buzzard by its white front and tear-shaped flank streaks. Forest Buzzard, as its name implies, is a species of evergreen woodlands including introduced eucalyptus and pines, whereas Steppe Buzzard prefers more open habitats. However, habitat alone is not a good indicator for these forms.

 

 

The Steppe Buzzard, breeds from eastern Europe eastward to the Far East, excluding Japan. It is a long-distance migrant, excepting some north Himalayan birds, and winters in Africa, India and south eastern Asia. In the open country favoured on the wintering grounds, Steppe Buzzards are often seen perched on roadside telephone poles. Steppe Buzzard is some times split as a separate species, B. vulpinus. Compared to the nominate form, Steppe Buzzard is slightly smaller (45-50 cm long), longer winged and longer tailed. There are two colour morphs; the rufous form which gives this subspecies its scientific name (vulpes is Latin for "fox"), and a dark grey form. The tail of vulpinus is paler than the nominate form, and often quite rufous, recalling North American Red-tailed Hawk. The upperwings have pale primary patches, and the primary flight feathers are also paler when viewed from below. Adults have a black trailing edge to the wings, and both morphs often have plain underparts, lacking the breast band frequently seen in B. b. buteo.

 

Chaffinch

 

 

The Chaffinch, Fringilla coelebs, is a small passerine bird in the finch family Fringillidae, also called a spink. Its large double white wing bars, white tail edges and greenish rump easily identify this 14-16 cm long species. The breeding male is unmistakable, with his reddish underparts and a blue-grey cap. The female is drabber and greener, but still obvious.This bird is widespread and very familiar throughout Europe. It is the most common finch in western Europe. Its range extends into western Asia, northwestern Africa, the Azores and Madeira. In the Canary Islands of Tenerife and Gran Canaria it coexists with its sister species, the endemic Blue Chaffinch.

 

It uses a range of habitats, but open woodland is favoured, although it is common in gardens and on farmland. It builds its nest in a tree fork, and decorates the exterior with moss or lichen to make it less conspicuous. It lays about six eggs.

This bird is not migratory in the milder parts of its range, but vacates the colder regions in winter. The coelebs part of its name means "bachelor". This species was named by Linnaeus; in his home country of Sweden, where the females depart in winter, but the males often remain. This species forms loose flocks outside the breeding season, sometimes mixed with Bramblings. This bird occasionally strays to eastern North America, although some sightings may be escapees.

 

Heron

 

 

The herons are wading birds in the Ardeidae family. Some are called egrets or bitterns instead of herons. Within the family, all members of the genera Botaurus and Ixobrychus are referred to as bitterns, and - including the Zigzag Heron or Zigzag Bittern - are a monophyletic group within the Ardeidae. However, egrets are not a biologically distinct group from the herons, and tend to be named differently because they are mainly white and/or have decorative plumes, and while having the same build as the larger herons tend to be smaller.

The classification of the individual heron/egret species is fraught with difficulty, and there is still no clear consensus about the correct placement of many species into either of the two major genera, Ardea and Egretta. Similarly, the relationship of the genera in the family is not completely resolved. However, one species formerly considered to constitute a separate monotypic family Cochlearidae, the Boat-billed Heron, is now regarded as a member of the Ardeidae.

 

 

The members of this family are mostly associated with wetlands, and prey on rabbits, fish, frogs and other aquatic species. Some, like the Cattle Egret and Black-headed Heron, also take large insects, and are less tied to watery environments.

 

Analyses of the skeleton, mainly the skull, suggested that the Ardeidae could be split into a diurnal and a crepuscular/nocturnal group which included the bitterns. From DNA studies and skeletal analyses focusing more on bones of body and limbs, this grouping has been revealed as incorrect. Rather, the similarities in skull morphology reflect convergent evolution to cope with the different challenges of daytime and nighttime feeding. Today, it is believed that three major groups can be distinguished, which are (from the most primitive to the most advanced):

 

* tiger herons and the boatbill
* bitterns
* day-herons and egrets, and night-herons

 

The night herons could warrant separation as subfamily Nycticoracinae, as it was traditionally done. However, the position of some genera (e.g. Butorides or Syrigma) is unclear at the moment, and molecular studies have until now suffered from a small number of studied taxa. Especially the relationship among the ardeine subfamily is very badly resolved. The arrangement presented here should be considered provisional.

 

Blue tit

 

 

The Blue Tit, Cyanistes caeruleus, is a 10.5 to 12 cm (4.2 to 4.8 inches,) long passerine bird in the tit family Paridae. It is a widespread and common resident breeder throughout temperate and subarctic Europe and western Asia in deciduous or mixed woodlands. It is a resident bird, i.e., most birds do not migrate.

 

The azure blue crown and dark blue line passing through the eye and encircling the white cheeks to the chin give the Blue Tit a very distinctive appearance. The forehead and a bar on the wing are white. The nape, wings and tail are blue; the back is yellowish green; the under parts mostly sulphur-yellow with a dark line down the abdomen. The bill is black, the legs bluish grey, and the irides dark brown. Young Blue Tits are noticeably more yellow. This is a common and popular European garden bird, due to its perky acrobatic performances when feeding on nuts or suet. It swings beneath the holder, calling tee, tee, tee or a scolding churr. The song period lasts almost all the year round, but is most often heard during February to June.

 

 

A Blue Tit will often ascend a trunk in short jerky hops, imitating a Treecreeper. As a rule the bird roosts in ivy or evergreens, but in hard weather will shelter in a hole. Blue tits are very agile and can hang from almost anywhere.

The Blue Tit has an average life expectancy of 1.5 years. The Blue Tit is a valuable destroyer of pests, though it has not an entirely clean sheet as a beneficial species. It is fond of young buds of various trees, and may pull them to bits in the hope of finding insects. No species, however, destroys more coccids and aphids, the worst foes of many plants. It takes leaf miner grubs and green tortrix moths (Tortricidae). Seeds are eaten, as with all this family.

 

The bird is a close sitter, hissing and biting at an intruding finger. In the South West of England such behaviour has earned the Blue Tit the colloquial nick-name "Little Billy Biter". When protecting its eggs it raises its crest, but this is a sign of excitement rather than anger, for it is also elevated during nuptial display. The nesting material is usually moss, wool, hair and feathers, and the eggs are laid in April or May. The number in the clutch is often very large, but seven or eight are normal, and bigger clutches are usually laid by two or even more hens.

 

Arctic Tern

 

 

 

The Arctic Tern (Sterna paradisaea) is a seabird of the tern family Sternidae. This bird has a circumpolar distribution, breeding colonially in Arctic and sub-Arctic regions of Europe, Asia, and North America (as far south as Brittany and Massachusetts). The species is strongly migratory, seeing two summers each year as it migrates from its northern breeding grounds to the oceans around Antarctica and back (about 24,000 miles) each year. This is the longest regular migration by any known animal. The arctic tern flies as well as glides through the air, performing almost all of its tasks in the air. The arctic tern lands once every one to three years (depending on their mating cycle) to nest; once they have finished nesting they take to the sky for another long southern migration.

 

Arctic Terns are medium-sized birds. They have a length of 33–39 cm (13–15 in) and a wingspan of 76–85 cm (26–30 in). They are mainly grey and white plumaged, with a red beak (as long as the head, straight, with pronounced gonys) and feet, white forehead, a black nape and crown (streaked white), and white cheeks. The grey mantle is 305 mm, and the scapulars are fringed brown, some tipped white. The upper wing is grey with a white leading edge, and the collar is completely white, as is the rump. The deeply forked tail is whitish, with grey outer webs. The hindcrown to the ear-coverts is black

 

Arctic Terns mate for life, and in most cases, return to the same colony each year. Breeding begins around the third or fourth year. Courtship is elaborate, especially in birds nesting for the first time. Courtship begins with a so-called "high flight", where a female will chase the male to a high altitude and then slowly descend. This display is followed by "fish flights", where the male will offer fish to the female. Courtship on the ground involves strutting with a raised tail and lowered wings. After this, both birds will usually fly and circle each other.

 

 

Arctic Terns are long-lived birds that spend considerable time raising only a few young, and are thus said to be K-selected. The maximum recorded lifespan for the species is 34 years. A lifespan of twenty years may not be unusual, with a study in the Farne Islands estimating an annual survival rate of 82%. The diet of the Arctic Tern varies depending on location and time, but is usually carnivorous. In most cases, it eats small fish or marine crustaceans. Fish species comprise the most important part of the diet, and account for more of the biomass consumed than any other food. Prey species are immature (1–2 year old) shoaling species such as herring, cod, sandlances, and capelin

 

 

Gannet

 

 

 

Gannets are seabirds in the family Sulidae, closely related to the boobies. The gannets are large black and white birds, with long pointed wings and long bills. Northern gannets are the largest seabirds in the North Atlantic, with a wingspan of up to 2 metres. The other two species occur in the temperate seas around southern Africa and southern Australia and New Zealand.

Gannets hunt fish by diving from a height into the sea and pursuing their prey underwater. Gannets have a number of adaptations which enable them to do this:

* they have no external nostrils;
* they have air sacs in their face and chest under their skin which act like bubble-wrap, cushioning the impact with the water;
* their eyes are positioned far enough forward on their face to give them binocular vision, allowing them to judge distances accurately.

 

Gannets are colonial breeders on islands and coasts, which normally lay one chalky blue egg. It takes five years for gannets to reach maturity. First-year birds are completely black, and subsequent sub-adult plumages show increasing amounts of white.

 

The three gannet species are now usually placed in the genus Morus, Abbott's Booby in Papasula, and the remaining boobies in Sula, but some authorities believe that all nine sulid species should be considered congeneric, in Sula. At one time, the gannets were considered to be a single species.

* Northern Gannet, (also known as "Solan Goose"), Morus bassanus
* Cape Gannet, Morus capensis
* Australasian Gannet, Morus serrator

Most fossil gannets are from the Late Miocene or Pliocene, a time when the diversity of seabirds in general was much higher than today. It is not completely clear what caused the decline in species at the end of the Pleistocene; increased competition due to the spread of marine mammals and/or supernova activity which led to mass extinctions of marine life are usually assumed to have played a role.