I've had this wild-caught black rat for 4 days. Twice there has been a spot on the paper towels that I use for substrate. It's a wet spot a little over an inch in diameter with yellow, grainy stuff in the middle. The yellow stuff looks sort of like cornmeal and is smaller in diameter than a dime. Anybody know what this is? This is my first snake, so I'm new to any and all snake excrement. Thanks.

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