Context:

Steve asks Phil if he has read 'the book The Beak of the Finch' during a discussion about how beak size changes in finches in the Galapagos in response to different food resources. Steve describes it as showing how you can watch selective pressures on birds and their beaks change as they adapt to new environments. Phil says he hasn't read it, and Steve suggests it might be too elementary for him but might be related to his research.