What type of animal is Gloria in the animated film "Madagascar"?

Madagascar is a 2005 American computer-animated comedy film produced by DreamWorks Animation and distributed by DreamWorks Pictures. It was directed by Eric Darnell and Tom McGrath from a screenplay by Mark Burton, Billy Frolick, Darnell, and McGrath, and features an ensemble cast.

Jada Pinkett Smith is the voice of Gloria, a strong, confident, but sweet hippopotamus.

At the Central Park Zoo, Marty the zebra celebrates his tenth birthday but has grown bored with his daily routine and longs to experience the wild. Marty's best friend is Alex the lion, who enjoys showing off for the public and his celebrity status as "the king of New York". Alex attempts to cheer Marty up, but Marty, still unsatisfied, learns that the zoo's penguins (Skipper, Kowalski, Rico, and Private) are trying to escape, and follows them out. Alex, Melman the giraffe, and Gloria the hippopotamus pursue Marty and attempt to convince him to return.

The four, along with the penguins and two chimpanzees named Mason and Phil, converge at Grand Central Station where the authorities sedate them using tranquilizer guns. Under pressure from anti-captivity activists, the zoo is forced to ship the escaped animals by sea to a Kenyan wildlife preserve. During their travels, the penguins escape and take over the ship, intent on taking it to Antarctica. Their antics on the bridge cause the crates containing Alex, Marty, Melman, and Gloria to fall overboard and wash ashore on Madagascar.