I think it would be an interesting project to study. I don't think reptiles have the capacity to premeditate an actual "suicide", (in the emotion-laden human sense) but I do think underlying pathogens may cause an animal to act abberantly, causing early death or unsuccessful breeding. Apply that to humans, too..
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1.1 Ball Python
0.0.1 corn snake
1.0 Bearded Dragon
0.0.2 fish
1.2 cats
3.1 kids
1.0 husband

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