The origins of nest-building remain obscure, but current observation of nest-buildingactiv

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,

Line such as incessant pulling at strips of vegetation or scraping of the soil. During the early

(5) 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

(10)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

(15)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 sparrowhawks will dive purposefully onto a

branch until it snaps and then hang upside down to break it off. Golden eagles, over

(20)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 ant1 most birds are able to carry an extra load of just over twenty percent of their

body weight.

The word "obscure" in line 1 is closest in meaning to

A．interesting

B．unclear

C．imperfect

D．complex