@FlyingNunFarm , you may be on to something Nunny Hunny.
Botulism causing spores can remain dormant in contaminated soil for years and germinate into toxin producing bacteria when a suitable nutrient source and an anaerobic environment are available. The toxin can also be found in maggots and litter beetles that feed on infected carcasses. Botulism is usually more common in the warmer months.
Conditions that favour the growth of this organism are found in decaying carcasses, and other decaying plant and animal matter, and in stagnant pools contaminated by rotting animal or plant material. When birds eat material containing the toxin, and if the toxin's dose is high enough, the characteristic signs of botulism will occur. Keep in mind this only metions carrion but it thrives on protein, be it animal or vegetable.