Invasive fish and other species demand vigilance and eradication efforts to preserve natural ecosystems.
Tropical lizard found on the upper river, where it was likely abandoned by its owner.
Polk and Bayfield counties will host last in a series of meetings to gather input on strategy to fight exotic plants and animals.
One of the biggest invaders in the St. Croix River is the zebra mussel.
Non-native fish could seriously harm sport fishing on Lower St. Croix.
For two consecutive years, almost none of the invasive species have been found in the river.