The spirit of this thread is for me to learn from you folks that hunt to the extreme (and some not so much).
Tom, I don’t think the fragments that show up on an x-ray is that big of a problem. Like when I was duck hunting and would spit out a pellet now and then. It’s the unseen fragments. The 5% loss of your weighed bullet(?)
I reached out to a friend that brought this up to me (by the way her hubby loves fishing and hunting and is very likely to be reading this thread now although I don’t think he’s a member), she passed my questions on to a person that has been studying the effects of lead for decades.
The amount of lead “experimentally” that would kill an eagle is amazing even if it was 4 times as much!
Here’s the response to my questions.
Are there any papers that show the effects of lead in gut piles?
There are papers and other sources documenting the presence of lead fragments in gut piles (Grund et al 2010 plus others).
There are trail cam data (and scientific papers) documenting many species of birds and mammals consuming gut piles.
There is a paper (Hunt et al 2003) documenting that pigs (surrogate for humans) fed lead-harvested venison (meat, not gut pile – harvested under normal hunting conditions) – had elevated blood lead levels
There are untold scientific resources documenting the impact of elevated blood lead levels in various animals, particularly humans
The seasonal pattern of lead toxicity in eagles is closely correlated with deer hunting season (Cruz et al 2010)
If the question is whether there is documentation of an eagle eating a gut pile in the wild and dying subsequently of lead poisoning, I am unfamiliar with one
Pass through shots – not quite sure what this question is, but think it refers to documentation of lead fragments being left behind when a lead bullet hits only soft tissue (ie – no bone)? This is shown nicely with ballistic gel. I believe there are are studies demonstrating this in carcasses, but do not have citations off the top of my head.The Grund study used thoracic shots, controlled to NOT strike the scapula, but did not control for rib strikes.
How much lead does it take to kill an eagle? Experimentally, 19-40mg of lead has been shown to be lethal to a bald eagle. One #6 shot contains 150mg lead (Fry 2003)
Sources:
Grund, M. D., Cornicelli, L., Carlson, L. T., & Butler, E. A. (2010). Bullet fragmentation and lead deposition in white-tailed deer and domestic sheep. Human-wildlife interactions, 4(2), 257-265.
Hunt, W. G.; Watson, R. T.; Oaks, J. L.; Parish, C. N.; Burnham, K. K.; Tucker, R. L.; Belthoff, J. R.; & Hart, G. (2009). Lead bullet fragments in venison from rifle-killed deer: Potential for human dietary exposure. PLoS One, 4(4), e5330.
Cruz-Martinez, L., Redig, P. T., & Deen, J. (2012). Lead from spent ammunition: a source of exposure and poisoning in bald eagles. Human–Wildlife Interactions, 6(1), 11.
Fry M. Assessment of lead contamination sources exposing California Condors. Species Conservation and Recovery Program Reports, 2003–02. Sacramento: California Department of Fish and Game, Habitat Conservation Planning Branch; 2003
Juli
Julia Ponder, DVM MPH
Executive Director, The Raptor Center
Partners for Wildlife │ Building excellence in wildlife rehabilitation
College of Veterinary Medicine, University of Minnesota
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tel 612.624.3431
I will though myself under fire here as well. I was prairie dog hunting twice this year. Mostly using a .17 HMR. The doggies were left knowing they wouldn’t go to waste. Yotes, bald eagles, ground owls and even other dogs took care of the carcasses. Should I be using copper? Hell, I don’t even know if they make a copper .17 HMR! <<< and that was part of my original post.
How much lead does it take to kill an eagle? Experimentally, 19-40mg of lead has been shown to be lethal to a bald eagle. One #6 shot contains 150mg lead (Fry 2003)
I gave up reloading some years ago. Does anyone have a scale that they can weigh out 40mgs of lead a post a photo of it?