In Other Species
"Suicide" has been observed in salmonella seeking to overcome competing bacteria by triggering an immune system response against them. Suicidal defences by workers are also noted in a Brazilian ant Forelius pusillus where a small group of ants leaves the security of the nest after sealing the entrance from the outside each evening.
Pea aphids, when threatened by a ladybug, can explode themselves, scattering and protecting their brethren and sometimes even killing the lady bug. Some species of termites have soldiers that explode, covering their enemies with sticky goo.
Asian black bears being used as "bile bears" are known to frequently try to kill themselves as a result of the severe pain caused by the permanent holes in their abdomen and gall bladder.
There have been anecdotal reports of dogs, horses, and dolphins committing suicide, but with little conclusive evidence. There has been little scientific study of animal suicide.
Read more about this topic: Suicide
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“Thus all probable reasoning is nothing but a species of sensation. ‘Tis not solely in poetry and music, we must follow our taste and sentiment, but likewise in philosophy, When I am convinc’d of any principle, ‘tis only an idea which strikes more strongly upon me. When I give the preference to one set of arguments above another, I do nothing but decide from my feeling concerning the superiority of their influence.”
—David Hume (1711–1776)