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Pardon my ignorance… A lip is apparently a very sensitive tactile device - as it at-least serves to warn it's owner they may just be about to consume something that could cause injury. Primates (including humans), dogs, cats, sheep, buffalo, elephants, some fish, octopodes - to name a few, have a lip.
How have lips evolved to be nearly ubiquitous across animals? Why have they evolved into a beak/bill in some birds & fish? What niche/purpose do they fulfill?
I think what you are looking for can be found https://en.wikipedia.org/wiki/Lips#Functions_of_the_lips and https://en.wikipedia.org/wiki/Beak#Functions pretty easily.
To summarize, lips:
- Mainly useful in mammals
- Food intake
- Articulation
- Tactile organ
- Erogenous zone
- Facial expressions
Beaks:
- Found in birds
- Feeding
- Defense
- Manipulation of objects
- Communication
- Heat exchange
What is a lip(s)? A set of muscles around an orifice that can close said orifice.
How about a way to close a hole so that not everything can get in but what we want - to eat, breathe, drink?
The fact that they are also sensitive is just needed so that you can more precisely operate them for whatever need you have.
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This exceptionally your opinion
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