One of mine will only eat white females. We've tried other colors and males, but he won't touch them. I don't know why. So, it's a process when it comes to feeding him. Luckily the others don't care. I have had issues with several of mine eating the pre-packaged frozen from petco or pet smart, which were gotten as a "crap last minute" purchase, they refuse to even sniff them more than once. But since you are feeding live, it very well could be their diet or bedding that gives off a peculiar scent.