Question: Sealand of the Pacific sold their orcas to which US chain of parks?

Context paragraphs:
Barbeques Galore: Barbeques Galore is a US chain of retail stores specializing in barbecue grills, accessories and consumables.  There are 23 company-owned stores, and several authorized dealers in the United States of America.  The US business was purchased by Grand Home Holdings Inc in late 2008.

Officeworks: Officeworks is a chain of Australian office supplies stores operated under Wesfarmers.  The company was established in the early 1990s by Coles Myer (which became Coles Group, now part of and owned by WA-based company Wesfarmers).  Its head office is located in Bentleigh East, Melbourne.  The store concept adopted by Officeworks was based on the US chain Office Depot.

Pacific series (railcar): The Pacific series was a fleet of fifty lightweight streamlined sleeping cars built by the Budd Company for the Union Pacific Railroad in 1949–1950.  Each car contained ten roomettes and six double bedrooms.  Union Pacific sold several to the Chicago, Milwaukee, St. Paul and Pacific Railroad (the "Milwaukee Road") in the late 1960s; Amtrak purchased most of the fleet in the early 1970s.  Several remain in use as business cars.

Stewart's Shops: Stewart's Shops is a US chain of convenience stores located primarily in eastern Upstate New York and southwestern Vermont, owned by the Dake family.

List of captive orcas: This article gives a list of captive orcas, or killer whales, large predatory marine mammals that were first captured live and displayed in exhibitions in the 1960s, or were subsequently born in captivity.  They soon became popular attractions at public aquariums and aquatic theme parks due to their intelligence, trainability, striking appearance, playfulness in captivity and sheer size.  As of September 2015, 58 orcas are held captive at facilities in North and South America, Europe and Asia, providing entertainment for theme park visitors.

Utah Southern Railroad (1871–81): The Utah Southern Railroad was built by the Mormons in 1871 to connect Salt Lake City to points south.  The line was acquired by the Union Pacific Railroad in 1875.  The Utah Southern Railroad name was initially kept as a separate division, but over time the line was moved around and divided among different UP subsidiaries.  A significant portion of the line, from Provo to Lynndyl is today known as the Sharp Subdivision.  The Union Pacific sold the northern portion of the line to the Utah Transit Authority which today uses the line for light rail.

Oscar Hilman: Oscar Hilman (born 1950), is a Filipino American, Brigadier General or BG, and US Army Commander of the Heavy Armor Brigade at Joint Base Balad and Logistics Area Anaconda aka Camp Anaconda, formerly known as Al-Bakr Air Base (Arabic: قاعدة البكر الجوية)in Iraq.  In Iraq, he was tasked to prevent troop and allied forces withdrawals from Camp Anaconda, one of the largest US military bases in Iraq.  In a series of town hall meetings, he spoke to the Filipino workers—often in Tagalog—and persuaded them to stay put by assuring them of their safety in camp.  To show good faith, he gave the contractors base privileges, a move that was approved by the US chain of command.

Small Smiles Dental Centers: Small Smiles Dental Centers is a privately owned US chain of dental clinics focused on serving children from low-income families.  As of March 2014 Small Smiles has 53 offices, and it says that it serves hundreds of thousands of children annually.  The parent company, Church Street Health Management (CSHM), has its headquarters in Suite 520 of the Castner-Knott Building in Nashville, Tennessee.  As of 2010 Church Street (previously known as Forba Holdings LLC or FORBA) is the largest dental management company in the United States.  Small Smiles is the largest dental chain for children in the United States.

SeaWorld: SeaWorld is a United States chain of marine mammal parks, oceanariums, animal theme parks, and rehabilitation centers owned by SeaWorld Entertainment (one park will be owned and operated by Miral under a license).  The parks feature killer whale, sea lion, and dolphin shows and zoological displays featuring various other marine animals.  There are operations located within the United States in Orlando, Florida; San Diego, California; San Antonio, Texas; later outside the United States such as Abu Dhabi, United Arab Emirates; and previously Aurora, Ohio.  On March 5, 2007, SeaWorld Orlando announced addition of the Aquatica water park to its adventure park family, which already includes SeaWorld and Discovery Cove.

Sealand of the Pacific: Sealand of the Pacific was a public aquarium in South Oak Bay at The Oak Bay Marina, near the city of Victoria, in British Columbia, Canada.  It housed a number of orcas, Haida, Nootka, and Tillikum.  In 1991, all three were involved in an incident in which a trainer, Keltie Byrne, was killed.  The aquarium subsequently closed and sold its orcas to SeaWorld.

Supporting paragraphs: Sealand of the Pacific SeaWorld
Answer: SeaWorld