smack your lips

to make a short loud noise with your lips before or after you eat or drink something to show that it is good

He drained his glass and smacked his lips appreciatively.

What better idea than to smack your lips and enjoy this product from the cecum fresh from the anus, ingest it anew, and extract valuable calories during its journey through the small intestine?

revolting

extremely unpleasant (= disgusting)

The food was revolting

So it is only logical that an animal perceives it own excrement as absolutely revolting to ensure it gives it a wide berth.

come as a surprise/relief/blow etc (to somebody)

to make someone feel surprised, relieve, disappointed etc

The news will come as no surprise to his colleagues.
It would hardly come as a surprise if ~

to be on the safe side

to do something in order to be certain to avoid an unpleasant situation

I’d take an umbrella, just to be on the safe side.

Shouldn’t we call the vet to be on the safe side?

lost in thought

thinking so much that you do not notice what is happening around you

Derek was staring out of the window, lost in thought.

Sometimes when I go out in the morning, lost in thought, to mark off a new section of the pasture for the horse, I forgot to swith off the power first.