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One thing I have noticed is my T's seem to prefer more opaque plastic enclosures. Now I don't use colored or dark non see through plastic. I am Assuming it is because they can't see movement going on around them as well. Maybe the deli cups are more see through then the hard plastic.Here is a picture to show what I am poorly describing lol.Martin does sound spot on with the female theory. That would be pretty crazy if you just happened to separate them like that.
One thing I have noticed is my T's seem to prefer more opaque plastic enclosures. Now I don't use colored or dark non see through plastic. I am Assuming it is because they can't see movement going on around them as well. Maybe the deli cups are more see through then the hard plastic.
Here is a picture to show what I am poorly describing lol.
Martin does sound spot on with the female theory. That would be pretty crazy if you just happened to separate them like that.