The entire head of some red-cheeked mud turtles is suffused with red.
Whether you consider the red-cheek a full species (Kinosternon cruentatum) or a subspecies of the scorpion mud turtle (K. scorpioides cruentatum), there can be little argument that some examples are one of, if not the, prettiest of the genus.

Long (and with good reason) a hobbyist favorite, the amount of red on the face of this 4 to 6 inch long aquatic turtle, can vary from little more than a facial smudge (and even this may dull with advancing age) to a long-lasting brilliant suffusion encompassing the entire head.

This small and easily kept turtle is native to the Yucatan Peninsula region (southeastern Mexico and Belize). Wild collected adult examples are still occasionally available and a fair number of hatchlings are produced in captivity.

Although these (and other kinosternids) can be kept in aquaria with shallow clean water, and although they seldom bask even when it is easy for them to do so, I do offer a shelf (or smooth flat rock, where they can rest an inch or two below the water’s surface. The turtles usually thrive on a diet of high quality pelleted food but will appreciate a periodic offering of a nightcrawler or a freshly killed minnow. Hardy and easily kept, be prepared to have your red-cheeks for decades.