Thursday, 10 March 2022
Wednesday, 9 March 2022
10-3-2022 CARRION DE CALATRAVA, LA MANCHA - LITTLE BUSTARD (Tetrax tetrax)
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The little bustard (Tetrax tetrax) is a bird in the bustard family, the only member of the genus Tetrax. The genus name is from Ancient Greek and refers to a gamebird mentioned by Aristophanes and others.
It breeds in Southern Europe and in Western and Central Asia. Southernmost European birds are mainly resident, but other populations migrate further south in winter. The central European population once breeding in the grassland of Hungary became extinct several decades ago. The species is declining due to habitat loss throughout its range. It used to breed more widely, for example ranging north to Poland occasionally. It is only a very rare vagrant to Great Britain despite breeding in France. On 20 December 2013, the Cypriot newspapers 'Fileleftheros' and 'Politis', as well as news website 'SigmaLive', reported the discovery of a dead little bustard in the United Nations Buffer Zone. The bird had been shot by poachers hunting illegally in the zone. The shooting was particularly controversial amongst conservationists and birders since the little bustard is a very rare visitor to Cyprus and had not been officially recorded in Cyprus since December 1979.
9-3-2022 ULLAL DE BALDOVI, VALENCIA - YELLOW IRIS (Iris pseudacorus)
It used to grow in the ditch of the fortified city of Mdina, on the island of Malta, where water was readily available, but after the renovation of the ditch it has since vanished from the area.
In some regions (including the US and South Africa) where it is not native, it has escaped from cultivation to establish itself as an invasive aquatic plant which can create dense, monotypic stands, outcompeting other plants in the ecosystem. Where it is invasive, it is tough to remove on a large scale. Even ploughing the rhizomes is often ineffective. It has been banned in some areas but is still widely sold in others for use in gardens.
Iris pseudacorus is reported as invasive in Connecticut, Delaware, Maryland, New Hampshire, New Jersey, North Carolina, Oregon, Tennessee, Virginia, Vermont, Washington, Wisconsin, and West Virginia.
Tuesday, 8 March 2022
Monday, 7 March 2022
28-3-2017 TARCOLES RIVER, COSTA RICA - AMERICAN CROCODILE (Crocodylus acutus)
The American crocodile (Crocodylus acutus) is the most widespread of the four extant species of crocodiles from the Americas. It is also one of the largest crocodile species. Males can reach lengths of 6.1 m (20 ft 0 in), weighing up to 907 kg (2,000 lb). Like any other large crocodilian, the American crocodile is potentially dangerous to humans, but it tends not to be as aggressive as some other species.
Unlike other species of crocodile, American crocodiles are not green. Their body is either tan grey or olive grey in color, covered with darker patches. Their belly is white or yellowish. The back of the crocodile is partially covered with bony armor, formed by so-called osteoderms or plates, which are more scattered in American crocodiles, than in other crocodile species. The top jaw has pointed teeth, having a conical form, and interlocking with the teeth on the bottom jaw of the animal. They have large fourth teeth on both sides of their bottom jaw, which are prominent even when the jaw is closed. The irises of their eyes are silvery in color while the pupil has a form of a vertical slit, helping the animal see well in low lighting conditions.
American crocodiles are found on Cape Sable as well as along Lake Worth and the southeastern coast of Florida. The area of their distribution includes both the Atlantic and Pacific coasts of southern Mexico, stretching to Peru and Venezuela in South America. In addition, this reptile inhabits many Caribbean islands, including Jamaica, Cuba, Hispaniola, and Grand Cayman. They live in freshwater environments such as rivers, reservoirs, lakes as well as estuaries, and swamps.
American crocodiles are most active at night. They spend the greater part of the evening submerged in water, which cools slowly, keeping them warm for a long period of time. These are not social animals. They prefer living alone and typically avoid disturbances. However, these crocodiles occasionally socialize, usually at sunset, when the temperature of their body is low. During the dry season, they become inactive: they do without food, spending their time buried in the mud. They love sunbathing, just like alligators. When having sunbaths, they gape, exposing themselves to the sun with their open mouth, which helps them regulate their body temperature. When facing danger, American crocodiles can be extremely aggressive. Unlike other crocodiles, they use acoustic signals to communicate. Crocodile communication is centered on short-distance communications during courtship and hatching.
These reptiles have polygynous mating system, where one male mates with a number of females. During the mating season, the animals become very territorial. Usually, males compete with each other for mating rights. During the breeding season, which lasts from April to May, females lay about 30-60 eggs. The eggs are typically laid in a hole or in an elevated place. As the hatching time approaches, the female visits the nesting site more and more frequently, until, in about 9-10 weeks after being laid, the eggs finally hatch. The female helps the young hatch out of the eggs and later accompanies the hatchlings on their way to the water. Soon the young disperse, leaving the hatching site and living independently. American crocodiles become reproductively mature at the age of 8-10 years.
The species is exposed to illegal hunting and poaching due to its hide. The American crocodile also suffers from the loss of their habitat as a result of human development, pollution, and commercial farming.
On the IUCN Red List, the American crocodile is classified as a Vulnerable species. The overall number of their population is unknown, but presently increasing. However, the total estimated population in Mexico, as well as Central and South America varies from 1000 to 2000 individuals.
The American crocodile is the top predator in its range. Due to preying on a wide variety of animals, this reptile controls populations of these species. In addition, the leftover food of the American crocodile is a source of food for other animals in the area.
Sunday, 6 March 2022
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