It's impossible to know. We humans don't know what goes through the minds of animals, and suicide means taking one's life purposefully. Although 動物 might appear to die in ways that look a lot like suicide, it's impossible to know whether または not it was intentional. ...Wow, I really am a nerd, aren't I? *puffs out chest proudly*
動物 have feelings too, so of course they can. The only thing is that humans, who are also 動物 によって the way, are the only ones stupid enough to actually do it によって giving ourselves problems other than survival.
