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Update - I knew I'd read it somewhere. Answer - the Scientific American from 2015. 'Howler Monkeys Trade Testicles for Decibels' https://www.scientificamerican.com/podcast/episode/howler-monkeys-trade-testicles-for-decibels/ Just think, I've been waiting 8 years to use this information...

I wish I could remember. I stroll through life, listening to and observing all kinds of useless information. I'm like a sponge, albeit one that leaks occasionally.

Among the howler monkey population of central and south America, the ones who howl the loudest, have the smallest testicles. I've no idea what point I'm making by the way. I didn't think that far ahead.