What did Starflight learn from Morrowseer as they flew over the island?

A Each NightWing could hunt or gather only about five days of every month.

B Princess Greatness had been killed while exploring the volcano.

C.NightWing scientists had found a way to increase the island's vegetation.
D.
Vengeance and an army of NightWings were on a mission to spy on IceWings.