Sivuqaq, also known as Jocko, was a Pacific walrus at the Six Flags Discovery Kingdom in Vallejo, California.^[3] He was the subject of several television and radio programmes,^[4][5]. Some of which focussed on the steps his keepers took to encourage him to mate successfully. He was one of a number of walrus calves brought to Vallejo in 1994; the three others were the females Qiluk, Uquq, and Siku. They were orphaned as the result of hunting near the city of Gambell, Alaska,^[6]. Gambell's name in Yupik "Sivuqaq" inspired his name. He died in 2015.^[7]

Sivuqaq was the subject of research on the vocalisation,^[8] reproductive habits,^[1] and cognition^[9] of walruses.

Sivuqaq appeared as Jocko in 50 First Dates.^[10]