Recently, I watched a documentary that depicted the Serengeti’s famous wildebeest migration as the animals forded a river in Tanzania. The wildebeests are reluctant to cross the river because of the huge crocodiles waiting to catch and eat them. While the majority safely make the crossing, a significant number are killed. We, too, have a perilous yearly migration here in coastal Humboldt (though thankfully without the blood and guts of the Serengeti). First, replace the crocodile-rich rivers with our roads, and substitute the ravenous crocodiles with our car tires. Then, in place of the wildebeests, picture fuzzy black-and-russet woolly bears. And there you have it, a wildebeest migration in miniature. Well, to me, anyway, it’s very similar. Why do woolly bears cross roads and streets every fall? This annual insect migration is undertaken by moth larvae (aka caterpillars) in the family Erebidae, which includes tiger moths. Locally, the banded woolly bear, which is the caterpillar of the Isabella tiger moth, is quite common. While the banded woolly bear is active all summer, grazing on many different herbaceous plants, it becomes most visible in the fall