For my personal project, The FPDAD Archives, I was researching howler monkeys as my latest addition to the project will feature a genetically manipulated howler monkey. I envisioned my mutant howler to make a very disturbing call sounding like something reminiscent of a demonic roar. But I wasn't sure what howler monkeys actually sounded like, so I figured I'd look it up for inspiration.
Let's just say the real animal sounds disturbing enough. They don't sound anything like I thought they did:
[link]-Rick Charles