Butter worms have at least twice as much calcium as any other feeder insect (measuring calcium as a percentage of body mass). This is a great asset to your pets, especially to growing young and pregnant females.
Their bright colour and fruity smell are an attraction to reptiles and other animals. This makes butter worms great for stubborn or picky eaters.
These worms can survive for 1 - 4 months if cared for properly. Store the butter worms in a refrigerator at 5 - 10 C approximately, and keep them dry. If their substrate becomes damp change it immediately to prevent problems in otherwise healthy animals.
Note that butter worms fair shipping better if the temperatures are somewhat cooler.