Corn Snake Behaviour

[nazanova]

So yesterday I fed my Corn Snake 2 mice for the first time yesterday so today I wanted to spot clean his tank and make sure he hasn't regurgitated anything or even pooped already. So I checked the tank and when I picked up his hide he was under to check he was obviously very defensive because he was still digesting but he had positioned himself up in the corner of the tank so I couldn't put his hide back where it goes. Knowing he was not happy I didn't want to pick him up or use my hand to move him so I used my feeding tongs to guide him out of the corner, but then he started rattling his tail like a rattlesnake and striking it against the tank really fast to make a really loud noise! Even him shaking his tail by itself was loud! So I just wanted to know is that normal Corn behaviour and has this ever happened to any other Corn Snake owners?