It’s October 31 and around the country children are dressing up as ghosts, vampires, zombies and Minions.

Meanwhile, wildlife species around the world face a different specter: the risk of extinction. Some have already passed across the veil to the other side.

“Extinction Countdown” has covered quite a few of these species over the years. Here are a few tales to get you in the Halloween spirit:

Photo by Wendel Fisher. Used under Creative Commons license