What is the name of the University of Maryland mascot?

The University of Maryland's mascot is named Testudo the Turtle. This choice is correct because Testudo is not only a representation of the Maryland Terrapins but also serves as the official live mascot of the university. Testudo has become emblematic of the spirit and culture of the university, often seen during athletic events, especially football and basketball games. The name "Terrapins" refers to the university's athletic teams, but Testudo is the specific name of the mascot, making it the most accurate answer for this question.

In context, the other options do not pertain to the University of Maryland’s mascot. "Terrapins" represents the broader athletic identity of the university, while "Bulldog" and "Fighting Illini" refer to other universities’ mascots. Thus, Testudo effectively captures the unique identity of the University of Maryland.