Continuity mistake: The character Imam has a large animal tooth on a necklace. Later than 5 minutes and less than 25 minutes into the movie Riddick and Imam are having an argument where in different shots of the same scene two different necklaces switch back and forth. The first, which is a significant plot point later on, is longer and plainer then the embellished, more curved second one.

The Chronicles of Riddick (2004)
Plot summary
Directed by: David Twohy
Starring: Judi Dench, Vin Diesel, Karl Urban, Thandie Newton, Colm Feore
Five years have past since Riddick, Imam and Jack left the planet. Riddick is tracked by Headhunters. Riddick returns to see his friend Imam and asks what happened to Jack, who has been set in a triple max prison. He then gets caught by the Necromengiens (who populate every planet and take over the population promessing them a better world in an other Universe called 'Underverse') and he escapes and gets caught again by those headhunters who take him to the prison. Where he searches for Jack/Keira. His mission is to save the universe.
Toombs: [Arriving at Crematoria] If I owned this place and Hell, I'd rent this place out, and live in Hell.
Trivia: In the opening scenes of the movie there are several massive statues representing necromongers. These statues are also in the film Batman. They are right in front of the building when the goons announce that they will be running Jack Palance's company.
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Chosen answer: The animals appear to be somewhere between a minor-class mimic of their surroundings and emotionally-triggered chameleons. As a sympathetic gesture towards Riddicks' dominant nature, it may have been altered purposely, or it was the animals' native eye color, when unstressed.