Maine is home to the largest moose population in the lower 48 states. But in one of the moosiest corners of the state, nearly 90 percent of the calves tracked by biologists last winter didn’t survive their first year. And the culprit? A tiny critter that is thriving in parts of Maine as the climate warms. This story is part of Maine Public’s “ Climate Driven: A deep dive into Maine’s response, one county at a time” series.