Given a statement, generate a question such that the answer is contained in that statement.

[EX Q]: most species go through vulnerable stages after birthing
[EX A]: What stage do most species go through after birthing?

[EX Q]: ferns are producers
[EX A]: Who are producers of what species?

[EX Q]: Animals with feathers have brains.
[EX A]:
Animals with feathers have what?