Counting Sheep: Research Pioneers Promising New Wildlife Survey Method
By — Ben Ikenson

Sound wildlife management requires good data. By helping determine animal population sizes, wildlife surveys are vital to effective stewardship strategies, whether for the benefit of game management or the conservation of endangered species.
“But counting animals is no simple task,” says David Stewart, a statistician for the U.S. Fish and Wildlife Service. “Surveys must contain desirable properties, and should produce an estimate that is consistent, unbiased and precise, and, most important, be easy to compute.”
For six months in 2017 and 2018, Stewart and other biologists from the Fish and Wildlife Service and the New Mexico Department of Game and Fish addressed the issue, and produced some promising results. Their research, recently described in Scientific Reports, pioneers an innovative new method to count animals by estimating their population sizes simply, safely, and affordably.

When it comes to being surveyed, all animals are not created equal. Those with distinct markings, such as ocelots or giraffes, make for more convenient individual identification, and therefore easier population surveys. Similarly, animals living in open areas, like Serengeti grasslands or arctic tundra, are readily observed and counted from small aircraft. Obviously though, many species don’t have distinctive spots or inhabit open landscapes — and a simple process is needed for counting them too. Read more








