Reading page 107 reading reading passage 1
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Reading-test-20
The Leatherback Turtle
Most sea turtles migrate seasonally between foraging and nesting grounds in spring and summer. Often, these migrations take them hundreds and even thousands of miles. The leatherback turtle is the record holder, travelling an astounding ten thousand miles or more each year in search of jellyfish, crossing the entire Pacific Ocean from Asia to the West Coast of the US. Sea turtles nest in tropical and subtropical regions around the globe. Both males and females will migrate to nesting areas to breed, generally in the area where they were born. It is not known exactly how adult turtles are able to navigate to their birth beaches, however, researchers think they may use a number of clues such as the Earth’s magnetic field and water chemistry. Also, while research efforts on nesting beaches are ongoing, relatively little is known about how leatherbacks exploit oceanic pathways. B The Dragonfly Dragonflies are capable of long-distance migrations, but until recently, scientists had no idea how far they travelled. In 2009, scientists discovered an eight to fifteen thousand mile dragonfly migration route that spanned from India to the Maldives, the Seychelles, Mozambique, Uganda and back again. Incredibly, the epic migration spans four generations of dragonflies, with each generation playing its part in the journey much like a relay race. It is easily the longest insect migration ever discovered and migrating insects might be the foundation of an airborne ecosystem that wings its way north and south from year to year. The migratory patterns and apparent decision rules of dragonflies are strikingly similar to those proposed for songbirds, and may represent a general migration strategy for long-distance migration of organisms with high self-propelled flight speeds. C The Wildebeest Perhaps the most famous animal migration is the journey of Africa’s Serengeti wildebeest herds, which travel by the millions in search of greener pastures. The great Serengeti wildebeest migration is the movement of vast numbers of these Serengeti animals, accompanied by large numbers of zebra, and smaller numbers of Grant’s gazelle, Thompson’s gazelle, eland and impala. They migrate throughout the year, constantly seeking fresh grazing and, it’s now thought, better quality water. The precise timing of the Serengeti wildebeest migration is entirely dependent upon the rainfall patterns each year. TEST 20 READING IELTS 5 Practice Tests, Academic Set 4 Page 112 Download 87.46 Kb. Do'stlaringiz bilan baham: |
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