The most commonly accepted theory suggests that the Black Bird of Chernobyl may have been the same creature spotted in Point Pleasant, West Virginia leading up to the collapse of the Silver Bridge on December 15, 1968. Investigators have suggested that the appearance of this creature is an omen of disasters to come in the area in which it shows itself. The physical description of both the Black Bird of Chernobyl and the Mothman, the creature sighted in West Virginia, are very similar, and the reports of nightmares and threatening phone calls leading up to these disasters are shared in both cases.
A second, less accepted theory, suggests that the Black Bird of Chernobyl was nothing more than the misidentification of the black stork, an endangered species endemic to southern Eurasia. The black stork stands nearly 3 feet tall and has a wing span of nearly 6 feet. This theory however fails to take into account the menacing phone calls and the the disturbing nightmares. Also the physical description given by the majority of eyewitnesses who actually saw the Black Bird of Chernobyl does not in anyway match the physical appearance of the Black Stork.
Both the Black Bird of Chernobyl and the Mothman have not been sighted since there respective disasters, leaving us with many unanswered questions. All we can do is wait for the beast to show itself again and give us a chance to figure out just what it may be, unfortunately it would appear that for this creature to show up again we will have to anticipate some form of disaster in the area it has selected to appear.