Yes they have free will but it is covered to the extent that it mostly acts mechanically. In its current life it may not have the intelligence to act morally.

Yes they have free will but it is covered to the extent that it mostly acts mechanically. In its current life it may not have the intelligence to act morally. But once( before it became a caterpillar ) it had a body of moral sentiment being with power of discrimination. It made bad choices at that time and thus induced suffering in current life.