Unmanned aerial vehicles (UAVs) have great potential for surveying wildlife, especially species that assemble in large numbers and that are easily disturbed by human presence.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/drones-enable-fast-accurate-wildlife-counts-study-shows
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/mongabay
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wildlife
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/census-habitat-monitoring
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/science-and-technology