FYI: http://www.vincelewis.net/monkshood.html
This page doesn’t make monkshood sound that effective as a hunting tool.
Never did a web search on the plant.
My reference was a book on the Aleuts which provided a history of their using aconitine to kill whales before European contact. IIRC, the natives in Alaska sometimes used the poison on brown bears.
Most poisons are much faster and much lower doses are needed if introduced directly into the bloodstream.
I, of course, am not a direct source. I only know what I have read.
BTW, I have read over 10,000 books in my lifetime. Reading is a compulsion with me since childhood.