Black Swan

The black swan (Cygnus atratus) is a large waterbird, a species of swan, which breeds mainly in the southeast and southwest regions of Australia. The species was hunted to extinction in New Zealand, but later reintroduced. Within Australia they are nomadic, with erratic migration patterns dependent upon climatic conditions. Black swans are large birds with mostly black plumage and red bills. They are monogamous breeders that share incubation duties and cygnet rearing between the sexes. Black swans have been introduced to various countries as an ornamental bird in the 1800s, but have escaped and formed stable populations. A small population of Black swans exists on the River Thames at Marlow, and near the River Itchen, Hampshire. Described scientifically by English naturalist John Latham in 1790, the Black Swan was formerly placed into a monotypic genus, Chenopis. Black swans can be found singly, or in loose companies numbering into the hundreds or even thousands. Black swans are popular birds in zoological gardens and bird collections, and escapees are sometimes seen outside their natural range. Black swans are mostly black-feathered birds, with white flight feathers. The bill is bright red, with a pale bar and tip; and legs and feet are greyish-black. Cobs (males) are slightly larger than pens (females), with a longer and straighter bill. Cygnets (immature birds) are a greyish-brown with pale-edged feathers. A mature black swan measures between 110 and 142 centimetres (43 and 56 in) in length and weighs 3.7–9 kilograms (8.2–19.8 lb). Its wing span is between 1.6 and 2 metres (5.2 and 6.6 ft). The neck is long (relatively the longest neck among the swans) and curved in an "S"-shape. The black swan utters a musical and far reaching bugle-like sound, called either on the water or in flight, as well as a range of softer crooning notes. It can also whistle, especially when disturbed while breeding and nesting.

Hyacinth Macaw

Many people are familiar with macaws and parrots as pet store animals. It might be difficult, then, for people to imagine what these large, loud, beautiful birds look like in the wild. The spectacular flash of color of a wild macaw is becoming more and more of a rare sight. The largest species of macaw, the brilliant-blue hyacinth grows to be up to 40 inches (1 m) long. The hyacinth macaw survives today in three known distinct populationin southern Brazil, eastern Bolivia and northeastern Paraguay. It is possible that smaller, fragmented populations occur in other areas of its range. Although it is difficult to estimate, some people believe there were more than 100,000 hyacinth macaws before the arrival of Amerindians in South America. In 1990, the wild population was estimated to be 2,500 birds. The world’s captive population is probably much larger, numbering in the thousands. The hyacinth macaw is found primarily in riverside topical rain forest and palm swamps. Its habitat varies throughout its range, however, from seasonally moist forest with a broken canopy, to mature palm forest, to grassy marshes. The hyacinth macaw nests in holes in trees. The clutch size is two or three eggs, although usually only one fledgling survives. The hyacinth macaw eats seeds, nuts, fruits, and vegetable matter. Eight species of palm are central to its diet. Its exceptionally powerful bill, the largest of its kind in the world, allows it to eat otherwise inaccessible nuts and seeds. Macaws can eat some poisonous seeds and unripe fruits that no other animal can digest. Scientists believe this is possible because the birds eat chunks of clay from river banks. The clay is thought to help absorb the poisons or make them harmless. Macaws play an important role in seed dispersal. They are messy eaters, carrying and dropping many nuts and seeds.