Researchers track New Hampshire moose in hopes of pinpointing cause of population decline

Summary: In some regions of northern New England, the moose population is down as much 40 percent in the last three years. The cause of this iconic animal’s dramatic die-off is not yet known, but researchers’ main theory is centered on the parasitic winter tick, and warmer winters may be partly to blame. Hari Sreenivasan reports from New Hampshire.