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About the size of a dinner plate.
They were in the same pond as some alligators.
Their neck was quite long!
...from babies to adults! Now all you have left to do is edit the fotos with the proper genus and species and you are all set! Best of luck to you!
this is definitely the Florida Softshell Turtle as bandhturtlesite suggests. Here is a link: http://en.wikipedia.org/wiki/Florida_sof...
I know this one very well. I lived on Sanibel for ten years. There are no other species that resemble the one in your photo