TOEFL Listening: ETS-TOEFL听力机经 - 01CJ9G33KRSXD142P$

What is the lecture mainly about? A. How the diet of shorebirds changes from when they nest to when they migrate. B. How shorebirds of the same species work together to gather food. C. How large numbers of shorebirds are able to find enough food in a small geographical area. D. How environmental changes have altered the typical diets of migratory shorebirds.