It HAS happened, but is NOT very common. I keep up with these posts while on breaks from a 12hr work day so I see and learn a lot from the breeders on here.
I have seen a post, that has even been reposted a few times in response to keeping snakes together, of two babies... where after each eating a mouse and being put back into their enclosure, one ate the other. So one baby ingested another baby and in total, two mice! I saw the pictures, it was horrible to see. I couldn't dig up the post... but I found someone who referenced it in this forum recently... here is a link to copy and paste for that pic... that snake ended up regurgitating its sibling and dying from the damage, probably from the digestive acids IMO.
http://forums.kingsnake.com/view.php?id=1432644,1432884
I also read a post recently about a guyana eating her breeder male while the owner was away on weekend. I haven't seen anything on it again since, but the person couldn't find the male and the female was hugely bloated. There were no pictures and I can't find the post so maybe she found the male escaped?
I don't know if you've seen the article about the boa eating it's ball python cagemate, it was also a post on this forum. I did look at that one, and saw pictures of the pythons regurged body afterwords, it was pretty morbid and depressing. I don't have that link, but maybe someone will repost it for you?
Like I said, it is a rare thing for boas to cannibalize IMO, but I've seen more on younger boas doing it than older ones. I'd be more worried about having a female boa squish her smaller breeder male by accident LOL! That has happened too. When a boa eats another boa, it is generally a mistaken feeding response. A wrong movement, the smell of prey on one snake... could be many factors to trigger that.
Enough rambling from me, sorry I don't have more incidents, but it makes me feel better that it isn't all that common. Even though I only put my snakes together to breed.... there is always a fear for me!
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Steph S.
Boas...
1.1 Albino boas (Loki & Hope)
1.4 07 Het. albino boas (Petty & Lady,Sierra,Madeline,Lola)
0.1 Reverse stripe poss. het albino (Cookie)
0.1 Salmon/hypo (Scarlet)
0.1 Anery poss. het snow (Missy)
1.0 Anery (Reno)
0.1 DH Sunglow (Bonnie)
1.0 Het. Anery (Guy)
0.3 Normals (Ophelia, Sasha, & Lulu)
1.1 Surinames (Solomon & Surreal)
1.2 Hogg Isles (Mr.Orange & Peaches, Apricot)
0.0.1 Central American (Sassy)
0.1 Emerald Tree boa (Jade)
1.0 ATB (Satan... seriously!)
Pythons...
2.1 GTPs (B., Monty & Jewel)
0.0.3 BPs (MJ, Precious, Houdini)
1.1 Carpet Pythons (Jackson & Charlotte)
0.1 Blood python (Akaia)
Misc.
1.1 Mandarin Ratsnakes (Jack & Jill)
1.0 Boxer/Pitt Mutt (Tyson)

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