Halloween countdown: In the days leading up to Halloween we’re going to be (re)introducing some of the ghostly, scary, mysterious and positively shocking animals at the New England Aquarium. Are you ready?

Have you carved your pumpkin yet? This would be a killer design. It’s a picture taken from the inside of a green sea urchin. Urchins can destroy kelp beds and are sometimes seen as pests—pretty scary stuff.