Posted: Tue Feb 23, 2010 11:15 pm
My red ear slider Charlie does this too against the tank glass sometimes. It's a display of dominance and is also part of the "mating dance" that males do to impress females. Just to be clear, Charlie is alone in the tank, but when he sees his reflection in the glass he does this thing with his front paws (and nails) and tells his reflection to bug off.

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Tank #1:
~Charlie - 4 inch male RES
Tank #2:
~Charlotte - 6 inch female RES