Zebra black and white at birth. Plains and mountain zebra foals are protected by their mothers, as well as the head stallion and the other mares in their group. Grévy's zebra foals have only their mother as a regular protector, since, as noted above, Grévy's zebra groups often disband after a few months. Attempts have been made to train zebras for riding, since they have better resistance than horses to African diseases. While occasionally successful, most of these attempts failed due to the zebra's more unpredictable nature and tendency to panic under stress. For this reason, zebra-mules or zebroids (crosses between
Green Zebra by the idea of a green tomato that was ready to eat. There is some controversy as to whether Green Zebra should be considered an heirloom tomato. Some people don't consider it an heirloom quite yet, while others consider it either an heirloom, "modern heirloom" or "created heirloom'. Common varieties include Green Zebra, Black Zebra, Big Zebra, and Red Zebra. The Green Zebra tomato does not often obtain a disease; however, if the tomato has a disease the Green Zebra will not turn yellow, the plant will stay green until it wilts. The Green Zebra has a higher defense rate