Figure 3
From: What seeds tell us about birds: a multi-year analysis of acorn woodpecker foraging movements
Maps of foraging flights. GIS maps of woodpecker foraging flights, from all acorns and granaries sampled in Q. lobata during years 2002 (A) and 2004 (B) and Q. agrifolia in years 2006 (C) and 2007 (D), showing locations of all trees of the species of interest (gray circles), granaries (open squares), and source trees (black circles). Lines between the granaries and source trees are un-weighted with regard to acorn frequency. Granaries that were also source trees (only the case for Q. lobata) are symbolized with a square filled with a black circle.