[culi]

The only reason our sweat even stinks is because of the way it's metabolized by our skin's microbiome. It turns out if you have AOB (ammonia oxidizing bacteria) they can oxidize our sweat and prevent us from stinking

AOBs are found in soils pretty much everywhere. But they're extremely sensitive and can easily be washed away. In contrast, the particular microbes that have closely evolved alongside us to adapt to our skin microbiome often live several layers deep in our skin. When we take a hot shower or soap up we kill them on the surface but, luckily for our skin's health, they can be replenished. However, the AOBs don't have this deep relationship with us because they are not anaerobic. Instead it's likely that we've evolved to expect a constant influx of soil-based bacteria on our skin

Indeed if you look at any other hairless mammals, one of their favorite things is mud baths. Elephant, pigs, rhinos, etc. We're still learning the full extent of how our skin microbiome plays into our health, but the recent research on the gut-brain-skin axis shows it's likely deeply integrated into our evolutionary past

[fingerlocks]

How many mammals actually sweat? I was surprised to learn that dogs don’t sweat, which seems obvious after the fact

[culi]

Good question. Human sweat _is_ indeed a pretty unique thing. Many animals sweat (e.g. horses, monkeys, hippos, etc). Some animals actually sorta do sweat but it doesn't play as big of a role in their biology as it does in humans. Dogs and cats only sweat in their paws for example

Humans are some of the weirdest hunters because of our incredible endurance. We're pretty slow creatures. If you're an ungulate that just got hit by an arrow, you can easily run away. But a human can keep following you for hours. Some hunter-gatherer groups will keep a persistent hunt going for up to 3 days

So yeah human sweat probably plays a pretty unique role in our physiology compared to most animals, but sweating is definitely not a uniquely human thing. And it's particularly more common in furless mammals