A few years ago I filmed 6 fish for 1200 hours with the goal of making a documentary about them.
The process would involve getting 1 fish in the tank, film for a week, get another, film forma week and so on.
I didn't notice a fatal flaw in this concept: in the first chapter I would have just 1 fish in a tank and I would have to write a narration. I couldn't, it wasn't working.
Then, out of desperation, I looked at the fish and I asked "What do you want to say?".
I had been looking both at the fish and the footage for so many hours that when I began writing the narration from the fish's perspective, it was like I was taking dictation.
Here's the trailer for the whole series:
Here's the first chapter (you have to enable subtitles):
That fish was alone, of course it was depressed and I could see that.
There's a problem when trying to make people be more empathic towards the suffering of others: our empathy level is dependent on such random stuff as size, facial expression ability or voice. It's not a rational response for the most part.
If someone asks me what would I like to achieve with these films, it's to make people realise that we're not that different.