英语听力：自然百科 大迁徙 Great Migrations—8
时间：2014-05-21 07:50:04
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（单词翻译）
For the delicate monarch1, it may as well be a trip to the moon. And yet somehow they do it, their tiny bodies attuned2 to a seasonal3 sundial and resonating to the invisible signature of the earth's core--its magnetic field. Around the planet, animals, large and small, are responding to these forces as palpable to them as they are indecipherable to us.
And far out to sea the largest brains on earth, fix on these mysterious cues. The male
sperm4 whale, a creature of superlatives. It is the largest toothed
predator5 alive today, weighing up to 50 tons. It dives deeper and faster than any other whale and it undertakes some of the greatest journeys. In a lifetime, this whale may log a million
nautical6 miles. The males often circle the Arctic to feast. But for the species to survive, their paths must intersect with the females' own
astounding7 journeys, coursing warmer waters. Many will meet in the Azores--nine tiny islands where clashing currents create an explosion of life.
A mother
ushers8 her newborn
calf9 into
coastal10 waters, guided by sun, sea currents and perhaps even magnetic
sensors11 in her brain. She also
navigates12 by sonar, bouncing her clicks and creaks off the sea floor, some of the loudest sounds made by any creature on earth.
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