One hypothesis is that an increasingly noisy ocean environment might be to blame. In fact one of the purpos of the Whale Acoustics organization is to study the impact of man made noi on this endangered population.
LIFE SPAN
Blue whales have a life expectancy of 35-40 years.
全神贯注意思Range: Blue whales live at the surface of the ocean and are found in all the oceans of the world. Blue whales have been found in every ocean of the world. Blue whales swim individually or in small groups. Pairs are very commonly en.
Extinct:
Blue whales were nearly extinct by the 1960’s becau of hunting, but blue whale hunting was outlawed by an international agreement in 1965.
Now, it is estimated there is a world population of about 10,000 blue whales, and 2,000 of the feed off the California coast every summer.
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WHEN YOU CAN SEE THE BLUE WHALES:公务员年度考核表
啦啦操串词Blue Whales can be en in Big Sur June through October, during times of abundant krill.
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WHERE YOU CAN SEE BLUE WHALES:
You can e Blue Whales from the roadside turnouts while in Big Sur. Monterey Bay Whalewatch sponsors boat trips out of Monterey Bay天花吊顶效果图
Introduction:
Blue whales are the largest animals ever known to have lived on Earth. The magnificent marine mammals rule the oceans at up to 100 feet (30 meters) long and upwards of 200 tons (181 metric tons). Their tongues alone can weigh as much as an elephant. Their hearts, as much as an automobile.
Blue whales reach the mind-boggling dimensions on a diet compod nearly exclusively of tiny shrimplike animals called krill. During certain times of the year, a single adult blue whale consumes about 4 tons (3.6 metric tons) of krill a day.
Blue whales are baleen whales, which means they have fringed plates of fingernail-like material, called baleen, attached to their upper jaws. The giant animals feed by first gulping an enormous mouthful of water, expanding the pleated skin on their throat and belly to take it in. Then the whale's massive tongue forces the water out through the thin, overlapping baleen plates. Thousands of krill are left behind—and then swallowed.
Blue whales look true blue underwater, but on the surface their coloring is more a mottled blue-gray. Their underbellies take on a yellowish hue from the millions of microorganisms that take up residence in their skin. The blue whale has a broad, flat head and a long, tapered body that ends in wide, triangular flukes.
Blue whales live in all the world's oceans occasionally swimming in small groups but usually alone or in pairs. They often spend summers feeding in polar waters and undertake lengthy migrations towards the Equator as winter arrives.
The graceful swimmers crui the ocean at more than five miles an hour (eight kilometers an hour), but accelerate to more than 20 miles an hour (32 kilometers an hour)
when they are agitated. Blue whales are among the loudest animals on the planet. They emit a ries of puls, groans, and moans, and it’s thought that, in good conditions, blue whales can hear each other up to 1,000 miles (1,600 kilometers) away. Scientists think they u the vocalizations not only to communicate, but, along with their excellent hearing, to sonar-navigate the lightless ocean depths.
Really Big Babies
Blue whale calves enter the world already ranking among the planet's largest creatures. After about a year inside its mother's womb, a baby blue whale emerges weighing up to 3 tons (2.7 metric tons) and stretching to 25 feet (8 meters). It gorges on nothing but mother's milk and gains about 200 pounds (91 kilograms) every day for its first year.
夜幕西饼屋Blue whales are among Earth's longest-lived animals. Scientists have discovered that by counting the layers of a decead whale's waxlike earplugs, they can get a clo estimate of the animal's age. The oldest blue whale found using this method was determined to be around 110 years old. Average lifespan is estimated at around 80 to 90
years.
Between 10,000 and 25,000 blue whales are believed to still swim the world's oceans. Aggressive hunting in the 1900s by whalers eking whale oil drove them to the brink of extinction. Between 1900 and the mid-1960s, some 360,000 blue whales were slaughtered. They finally came under protection with the 1966 International Whaling Commission, but they've managed only a minor recovery since then.
Blue whales have few predators but are known to fall victim to attacks by sharks and killer whales, and many are injured or die each year from impacts with large ships. Blue whales are currently classified as endangered on the World Conrvation Union (IUCN) Red List.
