for nest making so females always drink water before amplexus. The female is attracted by male's advertisement call and moves towards the calling male. During mating season, the frog is equally active during the day and night. Amplexus can last as long as six days, but the actual mating only takes place for four to six hours. The female first releases a signal for foam nest construction by arching its back. Then, the male immediately puts its feet near the female’s cloacal region and forms a collecting basket, where fertilization occurs. After this, the male raises its legs to water level and starts to beat the female’s foam secretion with the purpose of smoothing the surface. The beating lasts about 10–12 seconds with about 45 beats. After 45 seconds the female does the back-arching signal again, and the whole set of movements repeat. The construction of a foam nest usually takes 30 to 60 minutes. Calls and Vocalizations Male Perez’s snouted frogs can produce different types of sounds, but a typical one that can be heard from long distance is considered as an advertisement call, which consists of a series of three to five short, low whistles and two pulses per note. There is also another pre-mating call that has double pulses and a constant repetition rate. The dominant frequency is 1800–2700 Hz, and harmonics are concentrated at 4500-5600 and 700–7800 Hz. Male calling site choice is slightly different from female oviposition site choice because they face different selective pressures. Although both females and males avoid high-predation risk pools and benefit from a high offspring survival rate, males are less sensitive to the potential biotic and abiotic risks offspring will face. When choosing a site, male frogs focus more on predation avoidance and reducing competition for females, but females consider more about potential offspring survival. Thus, male are more likely to use a place that is poor for offspring but has a low predation risk and low competition for mates. Parental care Female Perez’s snouted frogs breed every four weeks under laboratory conditions. Females lay 30-154 small unpigmented eggs, 2.1 mm in diameter, in a foam nest about 60mm. The foam nest protects eggs and early tadpoles. In ideal conditions foam can protect tadpoles in dry pools for up to 13 days, with 50% survival up to 10 days. However, to complete larval development, at least two weeks in water