We are talking about animals and their unique nature and there are scores of stories based on real-life experiences. Even street dogs are known to be human friendly!
The answer is yes and know, as much as I remember that a specie of birds commit mass suicide although I have forgotten the name of the same.
may be this link will help you.
http://wiki.answers.com/Q/Do_any_animals_other_than_humans_commit_suicide
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Actually this contains such difficult twists and turns and some time religious related things confuse us therefore understanding fully is difficult. But it helps, thanks.
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