Kiwifruit is a small, oval-shaped fruit that has a thin, brown skin on the outside. The inside of a kiwifruit is the color green and has black seeds. They originated in China and improved in New Zealand. Kiwis are a subtropical fruit, so they should be stored in a refrigerator. To make a kiwi ripen faster, you can keep them in a closed plastic bag with either a pear, apple, or banana.