Suicide - in Other Species

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.