River Otters

River Otters as Biomonitors

A new study found that river otters in Illinois are being exposed to dieldrin, DDE (a byproduct of DDT), PCBs and other chemicals banned decades ago. Photo by Ivan Petrov



River Otters Activity (Videos)

©Wildlife Veterinary Epidemiology Laboratory – Illinois Natural History Survey


Figure 1. Grid system used to reference river otter scat location during scat surveys from 1 August 2011 to 31 August 2012, Illinois, USA. Given the variation in scat, different research teams may define “one scat” differently than another: (A) Multiple pieces of scat that likely represent one bowel evacuation. (B) One piece of scat that likely represents one bowel evacuation. (C) Portable grid system used to reference scat location. Arrow indicates new scat. See methods (Rivera et al. 2018)