Why do foals and young horses move their mouths funny when meeting new horses?

These foals were born following the rescue of 43 horses from Wellingborough in February

Shooting From The Horses Mouth EPISODE 61 ON THE MOVE 5 pt2

Shooting From The Horses Mouth - EPISODE 61 - ON THE MOVE 5

Breyer Horses - In Foal? - Jenna Foaling Again Part 2 Mini Whinnies Horse Movie Video Series

Horse Valley & Foals + Pegasus In New World - Lets Play Online Roblox Horse Games

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Birth of a New Foal - Jenna Foaling Breyer Mini Whinnies Horses Movie Part 0

Corolla Wild Horse Fund Welcomes Spring’s First Foals!

Przewalski's Horse Foals at the Smithsonian Conservation Biology Institute

Camilla Parker-Foals: Queen meets ponies at horse sanctuary

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Breyer Horses - Growing Ideas- Jenna Foaling Again Part 1 Mini Whinnies Horse Movie Video Series

Baby Horse First Bath - Lego Friends Foals Washing Station with Barbie - Toy Video

Baby Pegasus Foal & Friends - Horse Heart Lets Play Online Roblox Horses Game

Breyer Horses- New Job - Jenna Foaling Again Part 4 Horse Mini Whinnies Movie Video Series

Morays open and close their mouths to move water through their gills for re