My kids and I are having a little fun picking tomato hornworms off the tomato plants that got ahead of us while on vacation. Then we carry them to barn for treats to chickens. When fed to larger groups of chickens in pens, the hornworms are consumed whole without processing. When fed to single single chickens without competition, there is a lot of processing going on. A juvenile chicken will invest a good five minutes doing what appears to be removing the gut contents before the deflated remains are consumed. No such processing is used on similar sized catalpa worms.