A donkey.
They can be a real problem on the roads at night in some areas! . Here in Oz, we have some places where the feral donkeys are almost as thick as the kangaroos on the roads, especially at dawn and dusk; and in the numbers they reach fairly quickly in a good season, they can really devastate fences, crops, dams, water troughs & sources, the native vegetation, & cause a lot of erosion PDQ too!