乡村相机捕捉野生动物

Have you ever wondered what wild animals do when no one is watching?

Scientists have been able to document the "private" moments of wildlife with leading edge technology. Low cost, dependable and small modern cameras amount to a big help.

Cameras placed in hard-to-reach places have captured images of everything from small desert cats called ocelots to larger snow-loving felines called lynx in the northern Rocky Mountains.

Learning new information from far-away cameras

Grant Harris is a government biologist with the United States Fish and Wildlife Service in Albuquerque, New Mexico. In his words, "there's no doubt," that these rural cameras are important tools to learn new information on wildlife.

Harris said some images help scientists see the effects of climate change. For example, the desert animal javelina and the tree-loving coatimundi have been caught on cameras north of their normal habitat. Harris said this could mean global warming is expanding their range northward.

Researchers with the Wyoming Migration Initiative, or WMI, are among those using rural cameras along with global positioning systems, or GPS.

They attach GPS devices to elk, mule deer and antelope in and around Yellowstone National Park. Then they can record their movements, or migrations. But WMI director Matthew Kauffman says as those devices are limited so is the amount of information they can gather from GPS.

"You see one animal migrating, you don't know if it's migrating by itself, if it's migrating with a calf, or if it's migrating with 40 other animals," Kauffman said.

However cameras can be left in very rural areas for days, weeks or even months. They can provide information on how many animals are moving over a given period of time, he said.

Putting those cameras in place requires careful planning.

"There's this tension between subjectivity in where you put your camera and where it's statistically sound," Harris said.

Sometimes, humans appear in the images. "I've seen people moon cameras, and that's always funny," he said.

Rural video can show details about animal behavior, such as the calls made by migrating mule deer. Also, some cameras live-stream animal life, showing everything from bison in Saskatchewan, Canada, to the underwater kelp forest off of California's Channel Islands.

Camera problems

However, rural cameras have their problems too. Animals such as wolverines and bears sometimes attack them. Scientists do not know if the attacks are the result of anger or interest.

Also, the devices have become popular tools to help hunters look for animals. Some people argue that it is unfair to use the cameras that way.

Even with such problems, rural cameras are clearly an important scientific tool in researching wild animals.

I'm Phil Dierking.

Mead Gruver reported this story for the Associated Press. Phil Dierking adapted it for VOA Learning English. Caty Weaver was the editor.

Are you interested in watching video of animals in the wild? We want to hear from you. Write to us in the Comments Section or on www.hxen.net .