Well they can't talk so nobody knows for sure, but they are prone to ignoring, or what I perceive as ignoring. For all their amazing gifts, I don't believe vision is one of them. I kinda think my guy is virtually blind. I can't tell you how many times I
have run back into kitchen to reheat the meal. He almost always eventually takes it. I prefer it when he's in the hide but when he's out that signals he's "starving" and I best be ready for a flying BP. I'm guessing the are about 10 variables that make a perfect feed. And if you hit on 3 or 4 you'll have success. So to make a long story short, my answer is no clue. I just know when your BP refuses, your not meeting enough variables and that could be no fault of your own. Every 2 weeks is enough so no worries.