Reading page 107 reading reading passage 1
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Reading-test-20
D
The Caribou North America’s caribou populations migrate the furthest of any terrestrial mammal, a journey that can span more than three thousand individuals in a group annually. As summer approaches, caribou herds head north in one of the world’s great large-animal migrations. They may travel more than nine hundred and sixty-five kilometers along well-trodden annual routes. At the end of their journey, they spend the summer feeding. In these rich grounds, an adult caribou can eat five kilograms of food each day. This is where they will breed. When the first snows falls each year, the caribou turn south and complete the migration cycle. They spend the winter in forested areas for easier foraging and survive by feeding on lichens. Caribou have large hooves that are useful tools for life in the harsh northlands. The hoof’s underside is hollowed out like a scoop and used for digging through the snow in search of food. Its sharp edges give the animal good grip on rocks or ice. E The Zambian Fruit Bat Although only a few bat species are migratory, the ones that travel seasonally do so in spectacular fashion. In fact, the world’s largest air mammal migration is the annual journey of Zambia’s straw- colored fruit bats. An astounding eight million Zambian fruit bats blanket the air during the migration, as they travel to feed on their favorite delicacy, the musuku fruit. The concentration of the bats is very dense during the migration, with up to hundreds of bats per square metre. When they are busy clinging on tree branches, the snakes and crocodiles are always waiting to devour the unlucky bats which fall below the trees. Where bats live is dependent on the availability of food. When the food supply declines, bats have two options. They can hibernate to pass through the low or non-existent food supply period, or migrate to a place with a more abundant food supply. In some areas, bats will also do a combination of both. Download 87.46 Kb. Do'stlaringiz bilan baham: |
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