query: what islands did darwin study finches on?
answers: [ ' T h e p u r p o s e o f t h e e x p e d i t i o n , w h i c h l a s t e d f o r n e a r l y f o u r y e a r s , w a s t o s u r v e y t h e e a s t a n d w e s t c o a s t s o f S o u t h A m e r i c a , b u t i t a l s o t o o k i n t h e C a p e V e r d e I s l a n d s , t h e G a l a p a g o s , T a h i t i , N e w Z e a l a n d , A u s t r a l i a , M a u r i t i u s a n d S o u t h A f r i c a . ' ]