C.
The origins of nest-building remain obscure, but current observation of nest-building activities provide evidence of their
evolution. Clues to this evolutionary process can be found in the activities of play and in the behavior and movements of birds
during mating, such as incessant pulling at strips of vegetation or scraping of the soil. During the early days of the reproductive
cycle, the birds seem only to play with the building materials. In preparation for mating, they engage in activities that resemble
nest-building, and continue these activities throughout and even after the mating cycle. Effective attempts at construction occur
only after mating.
Although nest-building is an instinctive ability, there is considerable adaptability in both site selection and use of materials,
especially with those species which build quite elaborate constructions. Furthermore, some element of learning is often evident
since younger birds do not build as well as their practiced elders. Young ravens, for example, first attempt to build with sticks
of quite unsuitable size, while a jackdaw's first nest includes virtually any movable object. The novelist John Steinbeck
recorded the contents of a young osprey nest built in his garden, which included three shirts, a bath towel, and one arrow.
Birds also display remarkable behavior in collecting building materials. Crows have been seen to tear off stout green
twigs, and sparrow-hawks will dive purposefully onto a branch until it snaps and then hang upside down to break it off. Golden
eagles, over generations of work, construct enormous nests. One of these, examined after it had been dislodged by high winds,
weighed almost two tons and included foundation branches almost two meters long. The carrying capacity of the eagles,
however, is only relative to their size and most birds are able to carry an extra load of just over twenty percent of their body
weight.
【題組】46. The author mentions twenty percent in the final paragraph to indicate that ______.
(A) eagles are twenty percent bigger than most birds
(B) twenty percent of all nests include foundation branches
(C) the nests of eagles are twenty percent of larger than those of other birds
(D) birds can carry twenty percent of their own weight
寫作批改
VIP與詳解卡管理
私人筆記( 0 )
