'Green'에 해당되는 글 2건

  1. 2011.08.20 Green Turtle Chelonia mydas
  2. 2011.08.20 Green Anaconda Eunectes murinus

Green Turtle Chelonia mydas

When born, green turtles are only 5 cm (2 in) long. But they grow up to 1.5 meters (5 ft) in length and can weigh over 300 kg (700 lbs), making them the largest of the hardshell sea turtles.

The dorsal shell of the green turtle, or carapace, is wide, smooth, and brownish-olive in color. The underside of the shell, or plastron, is yellow. Green sea turtles are so named for the greenish hue of their skin. They have heads that cannot retract into their bodies, a trait commonly associated with turtles. Reaching speeds of up to 56 km/h (35 mph), their streamlined shell and paddle-like flippers aid in their ability to swim quickly and with grace.

Green sea turtles are able to hold their breath for hours at a time. Because they are cold-blooded, the temperature of the water affects their ability to hold their breath. In colder water they can hold their breath for longer.

With features well-adapted to sea life, their agile mobility underwater does not carry over to their travels on the beach. On land they move slowly, laboriously pulling themselves along with their flippers. But in general, green turtles only venture onto land to lay their eggs. Females lay eggs every 2-4 years once they are sexually mature.

To reach their nesting grounds, green turtles migrate long distances, traveling back to the beaches where they were born. After mating in the shallow waters near shore, female turtles climb onto the beach and lay their eggs in a pit. They lay 100-200 eggs at a time and leave them alone for 2 months before they hatch. Once the baby turtles hatch, they must crawl to the water and avoid a multitude of predators, including birds and crabs.

Green turtles make their home in tropical and subtropical oceans worldwide. There are two types of green turtles, the Atlantic green turtle and the Eastern Pacific green turtle. It is debated whether these are subspecies or completely separate species. Each of the populations has its own feeding and breeding grounds. Atlantic green turtles are found throughout the Atlantic Ocean, while Eastern Pacific green turtles are found in the Indian Ocean, Pacific Ocean, and Mediterranean and Black Seas. Over 80 countries in the world have green turtles nest on their beaches.

Green turtles feed on crabs, jellyfish, and other creatures as juveniles. As adults they become herbivores, primarily eating sea grasses and algae.

Conservation Status

According to the IUCN, green turtles are listed as endangered, and their numbers are decreasing. Green turtles are hunted and their eggs are collected by humans, a legal practice in some countries. Green turtles are also threatened by destruction of nesting areas and foraging areas in the sea. Sometimes green turtles are accidentally caught in fishing nets, further declining their population.

There are efforts to lessen the amount of turtles and eggs harvested in many countries. In addition, many countries are trying to protect the nesting and foraging grounds. They are protected under many treaties and laws.

What You Can Do to Help

Green turtles can use as many advocates as they can get. Make sure you do not purchase products made from this endangered species. Also, if you live an area that green turtles use for nesting, you can lead a community effort to protect the beaches they nest on.

Green Turtle Distribution

Green turtles make their home in tropical and subtropical oceans worldwide.

Posted by ralfowen

With an average length of 6 m (20 ft.) and a top length of 8.8 m (29 ft.) the green anaconda is one of the longest snakes in the world. The green anaconda, with a girth of nearly 30 cm (12 in.) and a weight of 227 kg (550 lb.), is the heaviest of all snakes.

The green anaconda is native to South America, making its home in swamps, marshes and streams. Their enormous size makes it much easier for green anacondas to swim in the water than to slither slowly on land. Their eyes and nostrils are on the top of their head allowing them to see and breathe while most of their body is under water.

Most of their time is spent in the water hunting. Although they use both sight and smell to hunt, they also have the ability to sense heat emitted by potential prey. Green anacondas prey on a variety of animals including fish, birds, tapirs, wild pigs, capybaras, and caimans (reptiles similar to alligators). They've even been known to eat jaguars.

Anacondas are not venomous; they use constriction instead to subdue their prey. Once an anaconda sights its target, it will grab the animal in its jaws, locking it in with its teeth. Once firmly grasped, the anaconda will coil around the prey and squeeze it until it dies of crushing or suffocation. It will then consume the carcass whole. For larger prey, the green anaconda can unhinge its jaw to stretch its mouth around the body. After a big meal, anacondas can go weeks without eating again.

Green anacondas have also been known to partake in cannibalism. Females, the larger of the sexes, have been reported to eat smaller male anacondas.

Green anacondas spend most of their time alone. However, between April and May, males seek out females for the opportunity to mate. Often times, multiple males will pursue the same female. This results in "breeding balls" of up to a dozen males wrapped around a single female, all attempting to mate. The breeding ball can last up to 4 weeks.

Once pregnant, the female will produce eggs inside her body. The eggs develop for 8-12 weeks and then hatch while still inside the mother's body. She then gives birth to as many as 80 tiny snakes, each 30-60 cm (12-24 in.) in length.

Green anacondas can live over 10 years in the wild. They can live up to 30 in captivity.

Conservation Status

Anacondas are sometimes hunted illegally for their skin or to be sold as pets, but this is rare. Their size makes them inconvenient pets, and their skin is not very popular for clothing and shoes. They are also very difficult to catch.

Another threat they face is habitat destruction. Despite this they are not considered endangered.

Green Anaconda Distribution

The green anaconda is native to South America, making its home in swamps, marshes and streams.

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Posted by ralfowen