i agree Joejr14 that an anery is the only "black corn" that i know of, and most people i talk to call them anery or black albino so i know what they are talking about. As to the feeding thing i do agree with quigs, but mine usually take it within an hour, but it can take longer and yeah leave them alone with the food to eat in peace.
Eather an anery or a black rat snake Dayoh, without a pic nobody can say for sure but just guess unless if it looks similar to the one tht joejr14 posted, let us know.