13----Wang, Y., Pan, Y., Parsons, S., Walker, M. and Zhang, S. (2007) Bats respond to polarity of a magnetic field. Proc Biol Sci 274, 2901-2905.download.pdf
12----Tian, L., Xiao, B., Lin, W., Zhang, S., Zhu, R. and Pan, Y. (2007) Testing for the presence of magnetite in the upper-beak skin of homing pigeons. Biometals 20, 197-203.download.pdf