“…Mucus excretion has not been observed in wild pandas [Edwards et al, 2006;Hemin Zhang personal communication]. The duration of periods of mucus excretion varies greatly with pandas' gender, age, physical condition and the facility in which they are kept [Zhu and Guo, 1999;Janssen et al, 2006]. Mucus excretion is proceeded by reduced food intake and changes in behavior, including reduced mating behavior [Zhu and Guo, 1999;Liu et al, 2006a,b], but there is no clear cytological or pathological evidence to show that mucus excretion is correlated with clinical disease [Janssen et al, 2006;Loeffler et al, 2006].…”