Animals that start with the letter "J" include a diverse range of species, from the powerful Jaguar, a big cat known for its strength and striking spots, to the fascinating Jellyfish, a gelatinous marine creature found in oceans worldwide. There's also the Jackal, a wild canine often seen in Africa and Asia, and the Japanese Koi, a colorful fish revered in Japanese culture. These animals showcase the variety of life that begins with "J" and highlight the beauty and adaptability of the animal kingdom.