This is a captive Lion in Taronga Zoo, Sydney. Captive animal doesn't like wild have aggressive hungry eyes ( I just guess, never been to Africa with 500mm). I took almost over 30 photos to get this one with her eyes fell like aggressive and point to a direction to what I wanted.

Tech. f4.0 iso1600
Canon Raw convert adjusted the saturation, sharpness, contrast. Slightly bur and darken bg with PS.