ELY, Minn. - Something is killing moose in Minnesota.

The state's moose population has declined by more than half since the early 2000s, and researchers are still trying to figure out why.

A new study, led by the University of Minnesota, is hoping to shed some light on the mystery. The study will track the health of 200 moose over the next five years, and researchers will collect data on everything from their diet and habitat to their exposure to parasites and diseases.

"We're hoping to get a better understanding of what's driving the decline," said study leader Dr. Michelle Carstensen. "Is it one factor, or is it a combination of factors?"

Researchers suspect that a number of factors are contributing to the moose decline, including:

* Parasites: Moose are known to carry a variety of parasites, including brainworm, liver flukes, and tapeworms. These parasites can cause a variety of health problems, including weight loss, anemia, and neurological damage.

* Wolves: Wolves are the primary predators of moose in Minnesota. While wolf populations have been stable in recent years, researchers believe that increased predation may be a factor in the moose decline.

* Climate change: Climate change is causing the moose's habitat to change. As the climate warms, the forests that moose rely on for food and shelter are changing as well. This can make it more difficult for moose to survive.

The new study will help researchers to better understand how these factors are affecting moose health and survival. The results of the study could lead to new management strategies that could help to reverse the moose decline.

"Moose are an iconic species in Minnesota," said Carstensen. "We're committed to doing everything we can to ensure their survival."