Pretty sure we are the only animals with pink rings around our mouth. It’s flipping weird.
It probably helps with verbal language understanding as humans often use mouth movements to interpret words (see McGurk effect). But I still think it’s weird.
Big pink rings.


They don’t really have plump ring lips like us.
It’s not just a hole with skin flaps. It’s this plump ring of fat around the hole that’s also tinted a bright color.
Dunno of any animal except us that has that.
You’re just getting too used to seeing those phony fat-lipped MAGA concubines. They’re normalizing that expensive carved up face image.
https://www.google.com/search?&q=red+lipped+batfish
https://www.google.com/search?&q=TONKIN+SNUB-NOSED+MONKEY
I googled weird lip animals and picked a couple
Those are both great and also emphasize how weird big high contrast lips are on animals.
Man, the Red-lipped Batfish is weird. It looks like someone made it in the Spore Creature Creator.
The Tonkin Snub Nosed Monkey is cute. It’s sad they’re critically endangered.
It’s been years since I watched a nature documentary and it’s nice learning about animals I was unaware of before today.
I think we have different ideas on what’s cute. Those monkeys are creepy.
Okay, but I was replying to the OP. What you’re doing here is bringing in a new dimension, i.e. “plump.”
Regardless, I think I already kind of answered that when I talked about kissing. Very few animals I know of do prolonged kissing. Humans do. That, and our sexual attraction cycle is more or less endless, whereas with most animals, it only happens during select times of the year.
As for “why” to both things? I think it’s because humans are vastly more helpless at birth compared to most other animals. We need lots of care, and for a prolonged period. So evolution has drastically increased the mechanisms of sustained attraction between the parents via things like prolonged sensual kissing and a near-endless sexual attraction.
SOME orangutans do: https://duckduckgo.com/?q=orangutan&iar=images&t=fpas
Ah so they do. How bout that. Yeah I would agree those are pretty close to human lips.