Carrot Pen

This pen, shaped like a carrot, belongs to ZPD Officer Judy Hopps.

Besides a pen, it also functions as a voice recorder, which Judy uses to record damning dialogue from Nick Wilde, that constituted a confession on his part that made him guilty of tax evasion, and thus blackmail Nick to help her in her case to find a missing otter.

Later, when the case was solved, Judy gave Nick the pen.

The pen was used again to record the monologue of Dawn Belweather as she'd admitted being the mastermind behind the predators going savage, and put her behind bars.