Artist's commentary
Flehmen Response
A behavior in which an animal curls back its upper lip exposing its front teeth, inhales with the nostrils usually closed, and then often holds this position for several seconds.
Wikipedia: Flehmen response
A behavior in which an animal curls back its upper lip exposing its front teeth, inhales with the nostrils usually closed, and then often holds this position for several seconds.
Wikipedia: Flehmen response