Regular sized Mealworms in a can. Mealworms are the larvae of the flour beetle and a treat for insectivorous reptiles and birds as well as fish. Turtles are also quite fond of mealworms. To improve the nutritional value, Lucky Reptile Herp Diner Mealworms have been cooked together with cuttlefish bone powder. This ensures a high level of calcium which is a very critical part of the diet of reptiles, birds and fish.