The GMO plant itself isn't what kills the insects which than poison the birds.. it's the poison that's sprayed on the plants.
Bt Delta Endotoxin
https://en.wikipedia.org/wiki/Lipopolysaccharide#Health_effe...an interesting side note, endotoxin test have relied on availability of horseshoe crab blood:
The standard assay for detecting presence of endotoxin is
the Limulus Amebocyte Lysate (LAL) assay, utilizing blood
from the Horseshoe crab (Limulus polyphemus).[44] Very low
levels of LPS can cause coagulation of the limulus lysate
due to a powerful amplification through an enzymatic
cascade. However, due to the dwindling population of
horseshoe crabs, and the fact that there are factors that
interfere with the LAL assay, efforts have been made to
develop alternative assays, with the most promising ones
being ELISA tests using a recombinant version of a protein
in the LAL assay, Factor C.[Most of the money is going into how to sell more pesticide rather than making the plants more resilient. GMO could eliminate pesticides altogether and that would make Monsanto and friends very unhappy.
A good way fir France to tackle this problem would be to allow GMO crops. Alas, hysteria and superstition are against sensible solutions.
The original comment looks shallow at first, but GMOs often contain pesticides inside the seed/grain because the companies designing them don't know how to control it. That could potentially harm birds in the long run, and definitely harms insects.