IV Discourse: Question 17-18 Choose the best answer for the blank
【題組】18. As long as the little owls remain in the nest, they’re completely dependent on
their parents for food. The problem is that the small
rodents that they eat can’t be split up. When Mom or Dad returns to the nest to feed
their offspring, only one chick can eat a time.
In many bird species, the oldest would simply outcompete the youngest, but barn
owls are different. __________ Younger owlets groomed older ones more often
than older ones groomed the youngsters. And in return, the older owlets fed their
younger siblings. In addition, older owlets preferentially offered food to their
hungriest siblings, even in the absence of grooming.
(A)It's mainly observed when males want to reproduce with females, so there
are many exchanges of food.
(B) Food sharing only happened when the researchers artificially provisioned the
owlets with extra food.
(C) It is rarely observed and quite impressive that in this species, there are so
many cooperative behaviors in chicks.
(D)Remarkably complex examples of cooperation can be found among animal
siblings, and even newly hatched barn owls know. that sharing is caring.
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