Saille,
When my BD was younger and really putting away the meat, I used to buy the hornworms for him. He went nuts for them! It seems their bright green color stimulates feeding, at least for Hannibal. They are very high in calcium and very low in fat.
Below is copied and pasted from Top Hat Crickets, who also sell horns.....
A tomato/tobacco hornworm is the larvae form of the Sphinx or Hawk moths.
Hornworms should be kept at room temperature. Shelf life: about 1 week.
Hornworms double in size every 2 to 3 days until reaching an adult weight of around 10 grams.
Adult hornworms average 3" to 4" in length.
Hornworms are plump and colorful with no exoskeleton or chitin for easy digestion.
Hornworms have the highest calcium content of any feeder on the market. (46.4mg/100g calcium, 3.07% fat). Great for brumating reptiles.
These hornworms are captive bred. Never, Never feed wild caught hornworms to any pet. Wild hornworms carry a toxin from eating tomato plants which will likely kill your animal.
The hornworm habitat must be stored lid side down. The habitat must be propped up slightly to allow air to circulate thru the lid. The lid should be removed daily to clean the feces. Daily cleaning of the lid will virtually eliminate any smell from your hornworms.
Check this page..............
http://www.greatlakeshornworm.com/ .....................and this one.......
http://www.mulberryfarms.com/horn2.htm
The only thing, however, is their extraordinary rate of growth! I would buy a pod of about 12 worms about 1 1/2" long, and in about a week they were too big for him to take. I would end up turning them out into the back yard for the birds. A lot of money wasted when you have only one animal that eats them. If you're feeding multiple animals, I'd say defininitely buy some. I used to get mine from Mulberry Farms.