My，what a big beak you have! For humans，adapting to climate change will mostly be a matter of technology.More air conditioning，better-designed houses and bigger flood defenses may help to make the effects of a warmer world less harmful. （1）

C

C

In a paper published in Trends & Evolution，a team led by Sara Ryding，a PhD candidate at Deakin University，shows that is already happening.Climate change is already altering the bodies of many animal species，giving them bigger beaks （喙），legs and ears.
   In some species of Australian parrot，for instance，beak size has increased by between 4% and 10% since 1871.Another study，this time in North American dark-eyed juncos，another bird，found the same pattern. （2）

G

G

   All that is perfectly consistent with evolutionary theory. "Allen's rule"，named for Joel Asaph Allen，who suggested it in 1877，holds that warm-blooded animals in hot places tend to have larger body parts than those in temperate （温带的） regions.（3）

F

F

Being richly filled with blood vessels，and not covered by feathers，beaks make an ideal place for birds to get rid of heat.Fennec foxes，meanwhile，which are native to the Sahara Desert，have strikingly large ears，especially compared with their Arctic cousins.
   Ms.Ryding is not the first researcher to take that approach.But it is hard，when dealing with individual species，to prove that climate change was the cause of an anatomical （解剖学的） changes.All sorts of other factors，from changes in prey to the evolving reproductive preferences of males or females，might have been driving the changes. （4）

A

A

The team combined data from different species in different places.Since they have little in common apart from living on a warming planet，climate change is the most reasonable explanation.
   （5）

B

B

That may change as warming accelerates.Since any evolutionary adaptation comes with trade-offs （妥协），it is unclear how far the process might go.Bigger beaks might make feeding harder，for instance.Larger wings are heavier，and bigger legs cost more energy to grow.

A.However，looking at the bigger picture makes the pattern clearer.
B.For now，at least，the increase is small，never much more than 10%.
C.Animals will have to rely on changing their bodies or their behaviors.
D.It seems that the future world is going to be hotter than humans are used to.
E.Therefore，the negative effects of a warmer world are visible in these animals' bodies.
F.Such adaptations boost an animal's surface area relative to its body，helping it to release extra heat.
G.Similar trends are seen in mammals，with species of mice and bats evolving bigger ears，legs and wings.