UAS imagery reveals new survey opportunities for counting hippos

A study using unmanned aerial system (UAS) imagery demonstrates that drone technology can provide accurate and efficient population estimates for the vulnerable common hippopotamus (Hippopotamus amphibius), offering a promising alternative to traditional survey methods. The research identifies optimal flight parameters, such as an altitude of 150 meters, and highlights the importance of environmental conditions like low sun reflection and minimal cloud cover for improved detection rates. Experienced observers achieved higher detection accuracy (86.5%) compared to inexperienced ones, with a correction factor (Factor 2) aligning well with previous studies using traditional aerial counts (1.22 vs 1.25). This approach not only enhances monitoring efficiency but also addresses the challenges of surveying species often overlooked in wildlife conservation efforts.

Linchant, J., Lhoest, S., Quevauvillers, S., Lejeune, P., Vermeulen, C., Semeki Ngabinzeke, J., Luse Belanganayi, B., Delvingt, W., & Bouché, P. (2018). UAS imagery reveals new survey opportunities for counting hippos. Plos One, 13(11), e0206413. https://doi.org/10.1371/journal.pone.0206413