At first sight I thought that was a butterfly undergoing metamorphosis. I have seen something like that on my orang plant before. It had the same horn on the tail.
The insect gets it's colour from consuming green leafs which happens to be it's major food.
If you haven't killed it yet, I would suggest you keep it and see what it turns into in few days time.
However, I also think you will need to spray your farm with pesticide because there could be more of that in egg form waiting to hatch and capable of causing major damage to your crops.
Bountiful yield is a farmer's pride
Thank you so much. Absolutely. I left it already because it was also scary the way it moves. I have also seen many changes of insects and more. But this no. I intended in going into some farm clearing up soonest.