Mammal, reptile, amphibian and invertebrate electrocutions on electric power networks in Iran

Abstract Electrical power systems are a ubiquitous part of the Anthropocene. Wildlife interactions with these systems can be positive, for example when natural nesting substrates are limited, but are frequently negative, for example when nests catch fire or nesting individuals are electrocuted. Electrocution research focuses primarily on birds because they, especially large species, are particularly prone to electrocution. However, many other animals are also electrocuted. To explore non-avian electrocutions, we used crowdsourced data from Iran, where electric utility personnel frequently describe unusual incidents on electric industry-focused social media channels. In posts from January 2014 to December 2023, we identified 120 reports of non-avian electrocutions involving mammals (74%), reptiles (24%), amphibians (1%) and invertebrates (< 1%). Most (91%) incidents involved correctly operating electrical systems, indicating that the design of these electrical systems did not account for potential animal contacts. A few (9%) involved malfunctioning electrical components (overturned or energized power poles) that would also have been hazardous to humans. The greatest number of electrocutions occurred as a result of contact with low-voltage and ground-mounted equipment. For example, 220–600 V freestanding switchboards accounted for about one-third of electrocutions. Many of the documented incidents involved outages (n = 71), or outages together with fire ignitions (n = 8), indicating cascading effects on human populations and the environment. Mitigation measures to prevent these incidents are widely available, and should be used throughout the electrical system. Future research should document and quantify non-avian incidents beyond Iran, to better understand the impact of electrical systems on non-avian wildlife.