2024 Jellyfish Calendar. Jellyfish are mysterious and beautiful creatures. Their fossils have been found in rocks that are over 500 million years old, and they have no brains! Did you know that a group of jellyfish is called a bloom? Please enjoy 12 months of these marvelous creatures! HIGH QUALITY: 2024 Jellyfish Calendar Size Closed: 12 x 12 Inch. Opened: 12 x 24 Inch. Does not bleed through! 13 Full Color Images in our jellyfish Calendar! All 2024 sea life calendar photos are hand selected from a wide array of photographers from around the world! No compromises are made on image quality or content color in our jellyfish wall calendar.