A series of images pulled from the movie of the same name on the Movies page.
A male sniffing a female's urine to determine her sexual receptivity.
He exhibits the flehmen posture, which opens up the passage to the vomernasal organ--used for detecting pheromones. Although nowhere near as distinct as in ungulates, it is still the same posture.
He then shakes his head a few times to clear the excess urine. Note the droplets of urine dancing in the sunlight.