The group, led by Terrie Williams and Chris Wilmers of the University of California, Santa Cruz, spent years working with engineers to develop a novel wildlife tracking collar to measure the energetics, movements and behaviors of animals in the wild. Energetic expenditure is the lifeblood of an animal, says Wilmers. “If they’re burning more calories than they’re consuming they’ll die. And without enough surplus calories, they’ll never reproduce successfully.”
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