Which species is most susceptible to Bt-maize, explain why?

Question : Which species is most susceptible to Bt-maize, explain why?

The correct answer is – Bt toxin protoxins are converted into an active form in the gut which solubilises the toxin crystals.
The activated toxin binds to the surface of midgut epithelial
cells and create pores that cause cell swelling and lysis and
eventually cause death of the insect