(color online) The lamb’s expected lifetime 〈T〉 vs. the degree of the lamb’s site k_lamb on the P2P network, which has 6299 nodes and 20776 edges. In each run, the lions are initially located at the four largest-degree nodes with one lion at each node, and we randomly select a node of degree k_lamb as the site of the lamb with the constraint that the site of the lamb and the sites of the lions cannot be overlapped, and then we conduct the capture simulation. The biased random walk parameter α is −1 for all three models. For each degree k_lamb, the results are the average of 10⁴ independent runs.