Hermit crabs need a lot of calcium to support the health of their exoskeleton, and this is especially true during molting. Ways to provide ample calcium to your crabs include the following: cuttlebone - readily available in pet stores (check the bird section) and can be given whole, or shredded and added to food.
Female elephants are called cows. Male elephants are called bulls. An entire group of elephants are reffered to as a heard. Elephants are very intelligent animals with complex social structures.
White rhinos are the second largest land mammal after the elephant. Adult males can reach 1.85m in height and tip the scales at a massive 3.6 tonnes. Females are considerably smaller but can still weigh in at an impressive 1.7 tonnes. White rhinos are also known as the square-lipped rhinoceros due to their square (not pointed) upper lip.