Behavioural ecotoxicology is a field of applied ecotoxicology, where researchers consider the alterations in the behavioural markers due to the impact of environmental toxicants or contaminants. In fact, understanding the changes in behavioural manifestations helps to understand the respective underlying neurological mechanisms in the organisms and therefore, it effectively helps to describe or predict the neuro-behavioural context of behavioural modifications due to exposure to anthropogenic pollutants. Through this review we are addressing how environmentally available chemicals (such as pesticides, heavy metals (or metalloids), plastics and also pharmaceuticals can have significant acute and/or long-term impact on the behavioural profile of organisms (bioindicator species).