Why camera traps fail to detect a semi‐aquatic mammal: Activation devices as possible cause

摘要: Camera-trapping represents a powerful tool in wildlife research, particularly when dealing with elusive and rare species such as otters (Lutra spp.). Nevertheless, detection problems arise trying to detect camera traps. We hypothesized that the temperature difference between otter emerging from water environment was too low be detected by standard passive infrared sensors (PIR). During June–September of 2010 2011 Sangro River basin central Italy, we designed tested new pressure trigger compared its effectiveness PIR. Results are encouraging suggest could able other semi-aquatic mammals. © 2015 The Wildlife Society.