I want to know the answer to the following question:
How much of their body weight do honey buzzards lose during migration?
All the background I'm provided with is that "Birds of prey such as honey buzzards which migrate using thermals lose only 10 to 20% of their weight during migration, which may explain why they forage less during migration than do smaller birds of prey with more active flight such as falcons, hawks and harriers.". Is that enough to answer the question?
Answer: yes