These insects (and snails) have been cooked in the can to maintain nutritional value, flavour and aroma. It also softens the exoskeleton of the insects for easier digestion and breaks the bonds between the collagen protein to make it absorbable by reptiles.
My bearded dragon liked these okay, although he prefers live bugs. Make sure to stick these in the fridge! It does not say anywhere on the label to refrigerate after opening so I left them out and within a few days they molded up.