Those things are alive - more than alive, they are going to get 'ya, eat the soul of you and your crew and even KILL your tank or worse...
So watch out, avoid abnandoned roads through the forested areas. Encountering one of these mighty beings above 60 km/h or so will destroy you...
Unfortunately some mystical spell prevents these events to show up in AAR, therefore I have no proof of evidence other than my word.