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Turtle

My girlfriend has a painted turtle that she has had now for about 2 years. Over that time his shell in the back where his rear legs come out has turned upward rather than flowing smoothly. Any ideas, if needed I can get a pic. Thanks
 
Well I initially thought it to be the cause of lack of calcium put he eats only pellets that say they have all the calcium needed, and he has a UV light to bask uner. But I have never heard that feeding him too much may cause the problem. I thought she did feed him alot but then he did eat it all so I didnt figure it to be a problem.
 
I have seen painted turtles in the wild, and have seen that some of them have that "flip" in the rear of the shell, while others do not. May be genetic, but turtles are not my strong suit!
 
I think it's an issue of aerodynamics.  Air flow across a turtle's shell creates lift when racing against hares and a fast turtle's back feet will begin to lose contact with the ground.  So, like a rear spoiler on a race car, the flip on the back of that shell creates a downforce for maximum power transmission from those churning legs.  It also helps during cornering and keeps a high speed turtle from tumbling off the track.  Your girlfriend's turtle has evolved for speed.
 
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