NB:This may not be a word-for-word transcript. Why Can’t Some Birds Fly? Gillian Gibb In the lush rainforests of Australia, birds roost in the low branches and amble across the forest floor, enjoying the shade and tropical fruits. But the...
For birds that nest or feed on the ground, this predisposition to flightlessness can be even stronger. When a bird species doesn’t face specific pressures to fly, it can stop flying in as quickly as a few generations. Then, over thousands or millions of years, the birds’ bodies change...
alpine grasses. for birds that nest or feed on the ground, this predisposition to flightlessness can be even stronger. when a bird species doesn't face specific pressures to fly, it can stop flying in as quickly as a few generations. then,...
A bird that doesn’t fly conserves energy,so it may be able to survive on a scarceror less nutrient-rich food source than one that flies.The Takahe of New Zealand, for example,lives almost entirely on thesoft base of alpine grasses.For birds that nest or feed on the ground,this ...
. birds have to be taught to navigate . a bird that has been caged will not fly long distances . some birds cannot fly at night . some birds seem to follow the stars when they fly at night5In total darkness, doves ___. . use landmarks . don't know which way to fly . fly ...
birds have to be taught to navigate. F. a bird that has been caged will not migrate. G. some birds cannot fly at night. . some birds seem instinctively to follow the star when flying at night.43. Under artificial stars, the bird in the cage . tried to fly in the same direction ...
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A.Birds have to be taught to navigate.B.A bird that has been caged will not.C.Some birds cannot fly at night.D.Some birds seem instinctively to follow the stars when flying at night. A.B.C.D.(33)A.BirdsE.B.AF.C.SomeG.D.Some 点击查看答案手机看题...
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A.birds have to be taught to navigateB.a bird that has been caged will not fly long distancesC.some birds cannot fly at nightD.some birds seem to follow the stars when they fly at night 2Task 5 Why don’t birds get lost on their long flights from one place to another Scientists ...