Isn't it all based on smell? I don't know about everyone else, but I use chopsticks to handle the pinkies (I'm still a bit squeamish....) and if I put them on top of the screen top of his tank for a just a minute, Xavier smells the mouse scent on them and pops right out of whatever hide and starts trying to reach up to the smell.
I guess there's partially a visual thing too though. Once when he was really hungry (I hadn't fed him for a week when he usually eats 2x a week!) he saw my fingers outside of the tank and started trying to shove his face through to what he apparently thought were a bunch of moving pinkie mice. Good thing he was inside and my fingers were outside.
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