Only three wolves seem to remain in Isle Royale National Park.
Tech Today reports that researchers from Michigan Tech observed the wolves during their annual Winter Study.
There were nine wolves observed last winter.
Scientists estimate there are 1,250 moose on the island and observed two visiting wolves, which came and then left across an ice bridge to the mainland.
This growing gap between the predator and prey populations is a trend that Michigan Tech researchers have tracked over the past four years.
The study’s report marks the project’s 57th year of observing wolves and moose in Isle Royale.
It is the longest running predator-prey study in the world.