Each node presents a vertebrate species. The size of the node is in proportion to the number of unique pathogen species found to interact with it. Edges between two nodes indicate they both share at least one possible pathogen species. The weight (thickness) of the edges is in proportion to the number of possible pathogen species shared between the two nodes. The location of each particular node corresponds to the size of all nodes in the graph and the weight of the edges linking this particular node with other nodes.