A: This is one of my favorite behaviors! This is called the flehmen response. It is fun to see, but it is actually a mechanism to initiate some really cool activity in the brain.
If you watch a horse do a full out flehmen, he will curl his upper lip, raise his head, maybe turn his head from side to side, make a bit of a snuffling sound, and afterward there will be clear, watery droplets from the nostrils. In adult horses it’s seen most often in stallions when they’re testing vaginal secretions from mares or sniffing urine
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