Some of these pictures and descriptions may give away plot details that you might not want to know before watching the film.
A scale from a Replicant snake provides a clue for Replicant hunter Harrison Ford to find one of the illegal aliens he's hunting. He finds a Replicant dancer dancing with a Replicant Burmese Python, because snakes are always the perfect fashion accessory for a woman dancing in the buff. After her act, she goes to her dressing room, takes the python from around her neck, and puts it on a coat rack as Ford questions her. We hear the snake hiss. (It's the law in movie sound design that all snakes must either hiss or rattle when you see them.)