I want to know the answer to the following question:
In Australia, what percent of passerine species are partially migratory?
All the background I'm provided with is that "Many fully migratory species show leap-frog migration (birds that nest at higher latitudes spend the winter at lower latitudes), and many show the alternative, chain migration, where populations 'slide' more evenly north and south without reversing order.". Is that enough to answer the question?
Answer: no