Hippopotamuses are creatures that inhabit the Pride Lands.
Hippopotamuses are large heavily built animals with short stubby limbs. Most are grey or a variation of grey/brown. They have big teeth sticking out of their mouth.
Hippopotamuses usually occupy the rivers. Every year, after the rain, Beshte and his father create "Hippo lanes" in the tall grown grass so other animals can walk through it.
In The Lion King films
In The Lion King, hippopotamuses appear briefly at the end of The Circle of Life and when Simba sings I Just Can't Wait to be King. They along with other various animals help Simba and Nala lose Zazu. They later appear at the end of the movie during the presentation of Simba's newborn cub.
In The Lion King II: Simba's Pride, they are seen during Kiara's presentation, We Are One, and Upendi. They also appear driving Kovu out, when Simba exiles him from the Pride Lands, and later at the end of the movie.
In The Lion King 1½, hippopotamuses appear when Timon and Pumbaa find Pride Rock. The hippopotamuses were attending the presentation of Simba, one of the hippos collapsed with many other animals when Pumbaa becomes a victim of his demophobia-triggered flatulence problem. Later, some hippos are seen when Timon and Pumbaa are disturbed by some noise from outside, which is actually Simba, Nala and the animals singing "I Just Can't Wait to Be King" while making an animal pyramid with many other animals like the original film.
In the midst of a flood, Timon is nearly swallowed by a hippopotamus.