LOL Tim I always hesitate to mention a color preference too but we have one snake that seems to be that way. Saoirse, one of our WC adult females, will absolutely refuse to strike at any rat other than a dark self colored rat or a very low white berkie type (basically a dark colored rat really). Anytime we've offered her anything else other than an overall dark colored rat, we get a refusal. Offer her the "right" color, she nails them in seconds. Very odd!