Question: Hunters excel in tracking animals because they often leave some sort of mark when traveling through the forest.
Based on this sentence, who is they?

Answer: animals

Question: The police arrested suspected members of Anonymous because they are cracking down on hackers.
Based on this sentence, who is they?

Answer: The police

Question: The dumpsters arrived each day to retrieve the garbage of the population, but they can be called to arrive if requested.
Based on this sentence, who is they?

Answer: The dumpsters

Question: The sailors fell off the boats because they were drunk.
Based on this sentence, who is they?

Answer:
The sailors