Great Migrations - 阅读测试答案

They involve special behaviours concerning preparation such as overfeeding and arrival.

Vertical movements by zooplankton daily in the ocean

Dingle is an evolutionary biologist who researches insects. His interpretation is more complicated than Berger's, citing those 5 features that differentiate migration from other forms of movement.

A National Forest has identified the path of the pronghorn

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The tern flies on while local gulls will dive voraciously for such handouts.

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Also the movement of aphids after depleting the young leaves on a food plant, their offspring then fly towards a different host plant, and no aphid ever returns to where it started.

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Dingle is an evolutionary biologist who researches insects.

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Birds will feed heavily in advance of a long migrational flight to fatten themselves.

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Forested hills rise to form a V, at one of the bottlenecks, leaving a corridor of open ground only about 150m wide, filled with private homes.

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The pronghorn, which resembles an antelope, though they are unrelated, is the fastest land mammal of the New World.

Hugh Dingle, a biologist recognised 5 features that apply, in varying combinations and degrees, to all migrations.

On its 20,000 km flight from the extreme south of South America to the Arctic circle, an arctic tern will take no notice of a fish that a bird-watcher gives along the way.

Joel Berger from University of Montana, researching on the American pronghorn and some large terrestrial mammals, prefers what he calls a simple, practical definition suited to his beasts

Vertical movements by zooplankton daily in the ocean - upward movement to seek food at night and downward movement to escape predators during the day - can also be considered migration.