Butterworms are nutritious, easy care (store the refrigerator, no feedings required); they also make great fishing bait.
Butterworms average about 3/4" to 1" (vary in length from 1/2" to 1-1/4"), are similar to a caterpillar, but are fatter and smooth to touch, like Waxworms.
**The Calcium content is twice that of any other feeder insect
Calcium (ml/100 grs) 42.90**
Butterworms are shipped in wheat bran, for bedding material and to absorb moisture. The Butterworm may eat a little while stored. They can be stored in the refrigerator at temperatures of 38-42 degrees F. Butterworms can be stored in the refrigerator for 1 to 2 months with minimal loss. Butterworms are a little more expensive than Silkworms BUT they have the advantage of being able to be stored for extended periods of time in the refrigerator.