Just watch nature documentaries. No really nature is pretty horrifying
Annual famines etc. Every waking moment for most animals is trying to survival and not get eaten. Matter of fact the fear of getting eaten has shaped entire ecosystems. The main reason humans can view nature pleasurably and aesthetically is because we are insulated to a lot of its dangers living as we do. The reality is pretty horrifying. I don't even wanna get into livestock we raise and how they living. Once you put into perspective how fukked up things are it gets depressing......and freakish.
For examples in some insects Wolbachia and Spiroplasma bacteria selectively target and kill only the male embryos. This is because they can only spread in females