I was happy to find your answer of: "God used bugs to annoy the Egyptians." This eased my conscience a bit but, my question is this:
I am feeding my reptiles and frogs live crickets and meal worms specifically bred as reptile food. Recently when I watch the crickets run and scramble as if they know that they will be a lizard's meal. I feel a bit guilty. Are there any biblical, Christian scriptures that urge us not to do this?
God made the animals you are keeping to eat live prey. What the lizards and frogs are doing is as God designed them. You are taking care of your animals by feeding them.
Yes, the insects are designed to avoid harm so they can continue to populate the earth, but they were also meant to be used as food for some of God's larger creatures, and in the case of a some insects, they could also be used by man for food. "For every creature of God is good, and nothing is to be refused if it is received with thanksgiving; for it is sanctified by the word of God and prayer" (I Timothy 4:4-5).