This is very interesting, and as long as it's not suffering, no need to cull it.
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You are way out of line here!
As far as tying them off and letting them dry up and die...how would you know that you wouldn't allow infection into the rest of the appendage and kill the chick??? You can't see inside to know how those legs are attached...
Well then, you must not think anything about a deformed child is cute then either. I, for one, think the chick is adorable, and if you can save him/her and they will have a good life then keep him/her.