Context: Some predators take advantage of the concentration of birds during migration. Greater noctule bats feed on nocturnal migrating passerines. Some birds of prey specialize on migrating waders.

Question: Who takes advantage of migrating birds?
Answer: Greater noctule bats

Question: What do greater noctule bats feed on?
Answer: nocturnal migrating passerines

Question: What do some birds of prey specialize on?
Answer: migrating waders