Black-knobbed Map Turtle
The Black-knobbed Map Turtle (Graptemys nigrinoda) is endemic to the United States. It is a small to medium size turtle. Males average 4 inches in length with females being larger at about 7 inches in length. It has a narrow head like other map turtles. Its skin is light gray.
This turtle is mostly an insect eater, but may also take crustaceans and fish when it is readily available.