Biologists attached cameras on collars to female caribou in the Fortymile herd, and came away with a wealth of data on the animals' diet and movements:
Caribou seek insect relief on a snow patch in Fortymile River country, as seen from a camera around the neck of a female caribou. This is a still image from a nine-second video the collar captured during a study of the herd using cameras that dropped to the ground in autumn.
Jim Herriges, with the Fairbanks office of the U.S. Bureau of Land Management, wanted to know what female caribou in the Fortymile herd ate during spring and summer. Biologists have studied the herd for decades; they wanted a greater level of detail and thought cameras might reveal what went straight into a caribou’s mouth.
He proposed capturing and fitting female caribou with collars that held a video camera for a few months. The collars popped off on Sept. 10 in both 2018 and 2019, the years of the study. With an army of volunteer video-watchers and a Ph.D. student who analyzed the data and wrote a paper on the results, the scientists found that female caribou were eating a lot more willow leaves than their droppings revealed.
“The mother is feeding on lichen and her baby, probably a couple weeks old, comes into view and quickly licks her muzzle a couple times to likely smell, taste and learn what the mother is eating. It was really neat to witness and capture this learned behavior taking place in a nine-second video clip.
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