﻿^^ti^f 
  ^ 
  — 
  Peruvian 
  Coastal 
  and 
  Highland 
  desert. 
  Top: 
  Typical 
  guano 
  bird 
  

   islands, 
  source 
  of 
  fertilizer 
  m 
  prehistoric 
  and 
  modern 
  economies. 
  Bottom- 
  

   La 
  Hoya 
  Pampa 
  sand 
  dunes. 
  (Courtesy 
  James 
  Sawders.) 
  

  

  