I do not know, but I wonder. Have animals the capacity to think of suicide? They seem, on occasion, to surrender to dire and lethal circumstances, but when some human rescues them, they come back to life from the dead and they find joy even, at least the ones who have the fortune of encountering decent human beings. And these are particular circumstances, of course. Not every animal comes back.
But it is these about whom I write. Have they a notion that they simply do not wish to live any longer?
And please, my friend, do not take my musing as evidence that I wish to depart life. It is curiousness that occupies me, not dire depression.