National Aquarium
Jellies Invasion: Oceans Out of Balance. 
Jellies live in every ocean and thrive in coastal and open waters, and are even right here in Baltimore's Inner Harbor. We rarely notice these translucent animals, but these prehistoric creatures have been here much longer than us. Because of recent changes to jellies populations including massive swarms, voracious eating habits, and habitat invasions, we now find that jellies are changing the balance of Earth's aquatic ecosystems. How can something so delicate have become such a problem?