When studying animal behaviors, biologists generally have to wait for something to happen — either for an animal to do something, or for one animal to provoke another. Alternatively, they could use robot animals, tempting them with sexy fembots, mama-bots or tasty prey.
Predators of the threatened Mojave ground squirrel include badgers, coyotes, snakes, falcons, hawks, and U.S. military aerial strikes. That's because the squirrel makes its home in a section of California's Mojave Desert also used by the Air Force as a practice area. But the military has to make sure not to accidentally bomb the squirrels, them being threatened and all, and expends a lot of time and money trying to find them so as to avoid that.