South Florida turtle: please help identify

[zorak1]

These keep turning up in my yard and most recently in my pool in Boca Raton.
They are usually the size pictured (size of a grown man’s thumbnail or so).
What is it?

In addition to baby softshells, these guys are ubiquitous and bold this year. This is maybe the third or fourth I’ve found, one even showed up on my doorstep a month ago. Been letting them go in a nearby pond.

 

[B.P. Reptiles]

mud or musk turt

 

[nickolasanastasiou]

It is a common stinkpot musk turtle. Sternotherus odoratus.