Is this normal...?

I used to look after a race horse that did it, everyone thought is was quite cute, it's as though there trying to get every bit of taste of the last thing they have eaten lol lol
 
My horse does this but once he has his tongue bent over he uses it to pull his bottom lip in his mouth too so he looks like he is sucking his lips. He does it every day when hes turned out before he goes off to graze!
 
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