The preservation society managed to rescue a rare species of birds since they have the funding and resources to dedicate to saving animals.

Who is "they" in this prior sentence?
The preservation society
Medics have a tough job of trying to heal the wounded since they normally have to fix them in hostile environments.

Who is "they" in this prior sentence?
Medics
George talked to Bill because he had experience.

Who is "he" in this prior sentence?
Bill