Passengers on a fishing charter boat off the coast of Massachusetts were treated to a rare sight on Sunday — an orca.

Chatham-based Got Stryper Fishing Charters shared video on Facebook of the marine mammal, known as a killer whale, that was spotted east of Chatham.

The Atlantic White Shark Conservancy wrote that orcas, which are actually members of the dolphin family, have been spotted in the area before, but “it’s very rare.”

“Absolutely amazing,” the nonprofit wrote, sharing the video.

Tourists aboard a charter boat got a glimpse of an orca 12 miles off the Cape in 2016.