What use a pair of lips?

What use a pair of lips?

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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 and pretty easily.

To summarize, lips:

  • Mainly useful in mammals
  • Food intake
  • Articulation
  • Tactile organ
  • Erogenous zone
  • Facial expressions


  • 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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