17. Piersma and Gill suggest that bar-tailed godwits-long-billed shorebirds of the Eurasian and Alaskan tundra -rank among the most _____ of the long-range fliers, traveling 11,000 kilometers nonstop across the Pacific.
Answer: D,F
Bar-tailed godwits are among the most unflagging of the long-range fliers.
Bar-tailed godwits are recognized for their remarkable ability to travel long distances without rest, making them unflagging in their migratory journeys.
A) unpredictable
This option is incorrect because the term "unpredictable" does not accurately describe the migratory behavior of bar-tailed godwits. Their long-distance flights are well-documented and exhibit a consistent pattern, indicating they are reliable in their migration.
B) versatile
While "versatile" suggests adaptability, it does not specifically convey the endurance required for long-range flights. Bar-tailed godwits are known more for their stamina and continuous flight rather than versatility in their migratory routes.
C) erratic
The term "erratic" implies inconsistency or unpredictability, which contradicts the known migratory patterns of bar-tailed godwits. These birds demonstrate a remarkable ability to fly long distances in a steady manner, rather than erratically.
D) unflagging
This option is correct as "unflagging" accurately describes the relentless stamina of bar-tailed godwits during their long-distance migrations. They can travel substantial distances without stopping, exemplifying their endurance.
E) renowned
Although bar-tailed godwits are indeed well-known for their migratory feats, the term "renowned" does not capture the specific quality of their journeying abilities. It focuses more on their reputation rather than their physical capability to sustain long flights.
F) indefatigable
Similar to "unflagging," "indefatigable" emphasizes tireless endurance and the ability to persist without fatigue. This term is also fitting for bar-tailed godwits, as they are capable of maintaining prolonged flights without rest.
Conclusion
The correct answers, "unflagging" and "indefatigable," highlight the extraordinary stamina of bar-tailed godwits in their long migratory journeys. Other options fail to accurately reflect this specific characteristic, focusing instead on variability or reputation rather than the remarkable endurance exhibited by these birds during their extensive flights.