Mothman is usually decribed as a bipedal, winged humanoid. It's coloration varies from gray to brown to even white. It is reported to be about 7 feet tall, with a wingspan of about 10 feet or more. No head has ever been reported. Instead, two huge red eyes are set in the chest. These eyes are reported to be glowing, or at least reflective. The details of his face (if it has one) and his feet have never been adequately described. Only one witness ever saw the face clearly, and she could only say that the details were horrible and monstrous. She had terrible nightmares and nearly suffered a nervous breakdown. Anyone who gets a close look at Mothman seems to suffer from extreme fear and psychological distress, sometimes lasting for months or years afterwards, all out of proportion to how scared they ought to be. In particular, people say that a sense of pure evil overcomes them when they see Mothman's eyes.
Mothman is perhaps six or seven feet tall when standing. He can fold his wings and walk with a weird shuffle that many witnesses compare to a penguin. When he flies, he unfolds his wings and shoots straight up with great speed, then levels out to go wherever he wants to go. He has never been observed flapping his wings, not even on take-off. He just holds then straight and stiff. He can fly much faster than any bird should be able to fly, as measured by those victims who suffered from what seems to be Mothman's favorite activity: chasing cars.
Mothman sightings have been associated with at least two other cryptids. Gigantic thunderbirds with gray bodies and red heads were sighted in the same area at the same time by a few witnesses. There was also a bizarre hairy humanoid of the type that researchers call "big hairy monsters" or "hairy bipeds." This big hairy monster was quite weird because it was headless. The only footprints that have ever been associated with Mothman sightings are very bizarre, consisting of footprints that are unmistakably those of a dog mixed with a few classic Bigfoot footprints. However, these dog footprints have two abnormal characteristics. They are far too big for any known dog, and are pressed into the soil so deeply that they suggest the animal must have weighed several thousand pounds. So far, nobody has claimed to see the giant dog that is suggested by these footprints. Since nobody has seen mothman's feet, they may be his footprints because a creature of that size can weigh a lot.
Mothman is not unique in cryptozoology. Many similar cryptids and creatures have been seen worldwide. The sightings are similar to Mothman is many ways, including the fact that most of them seem to be heralds of impending disasters. Some of the places Mothman or it's fellows have visited include a mine in Freiburg, Germany, where a Mothman like creature scared miners away shortly before a collapse. Another notable visit was to the nuclear plant at Chernobyl, where a creature haunted the facilities for a while before the famous nuclear meltdown. Two not so popular incidents with Mothman were 9/11 and the Minnesota bridge collapse. There were two pictures taken on 9/11 and there were multiple sightings before the bridge collapse.
Some believe that the Mothman tries to warn people about disasters about to happen. Such as the Freiburg and Chernobyl sightings listed above. However the sightings at Chernobyl never happened, it started after the fact on the internet. Since there only seems to be one Mothman instead of a bunch of his kind, and since he seems rather paranormal, these sightings are not of much interest to cryptozoologists. Cryptozoologists want to discover new kinds of creatures, not hunt for ghosts and spooks. Those who have looked into the problem have suggested sandhill cranes, thunderbirds, or some variety of unknown bird or giant bat or a genetic thing. Mothman is one of the most well known Cryptids in the world.