That is actually a urban legend. 
Do a search on lemming suicides, fact or fiction.
I will describe my point even further:
People are the only animals to lead themselves to reasoned suicide.
You think so? 
Apart from metaphorical analogies, yes it is a urban legend. I did a search on the subject on google.
Some animals do commit suicide after a fashion. Those which become discontent will starve themselves.
^ Yeah, I’ve heard of turtles starving themselves to death when they are upset about something.
Chimps can’t swim, like at all, and chimps are documented jumping in and drowning to ‘save’ another chimp. Whether the chimp realizes it or not, thats effectively suicide.
Most animals don’t even know their alive to reason through killing themselves though.
Hence, reasoned suicide is unique amongst people because our species remain in a perpetual state of absurdity and misery.
( Atleast for the people committing suicide anyways.)
Reasoned suicide is unique to our species because reason is unique to our species. Seriously, the world doesn’t bend to your nonsensical ignorant delusions, stop insiting that it does.
It has nothing to do with absurdity and misery, but the fact that say, we can have this fucking conversation and animals can’t. Jesus Christ you’re annoying, consistantly insisting to ignore everything but your own narrowly focused beliefs.
I see. This unique reason you seem obssessed with which you believe makes us special creates suicides and other forms of misery for millions of people yearly around the globe but since I mention such a subject specifically on a internet thread I’m somehow annoying for doing so. 
No, you’re annoying for constantly running you’re mouth without ever knowing wtf you’re talking about.
Yes humans experience depression/suicide above animals, we’re also capable of self-awareness/theory of others CONSISTANTLY. I’ll take self-awareness over ignorant bliss, i never suspected you’d choose self-awareness if you could. I’ll take knowing i’m alive and that other people walk around with thoughts/intentions like mine, opposed to avoiding ‘depression’ and remaining an unthinking machine.
Would you like to be a roach?
You are so full of yourself and a fallacious anthrocentric to boot.
It is too bad that everyone in this world can be as perfect as Cyrene…
Go whine and moan in someone elses thread. This website doesn’t exist for catering to someone elses grandeur complex.
Yeah, you don’t have to be perfect to stop making continously nonsensical irrelevant incoherent arguements/conclusions that you force down the rest of our throats as truth without any compelling reason to believe it. No, i’ll contradict you every chance I get, infact I rather enjoy it.
‘state of absurdity, suicide blah blah other animals blah blah’
Make a fucking coherent point for once.
Hears a annoying gadfly buzzing around. Where is Joker’s fly swatter at?
There’s coherency in a existence of absurdity? Well what do you know… 
Reasoned suicide, meaning sitting down and saying “Yeah, I think I should just end it now.” is unique to humans. Other animals will refuse to eat because they are sad and no longer care to live or die, but they do not commit active suicide so much as passive suicide.