I want to know the answer to the following question:
What preys on nocturnal passerine migrants?
All the background I'm provided with is that "Predation can be heightened during migration: Eleonora's falcon Falco eleonorae, which breeds on Mediterranean islands, has a very late breeding season, coordinated with the autumn passage of southbound passerine migrants, which it feeds to its young.". Is that enough to answer the question?
Answer: no