The Jacko hoax was a Canadian newspaper story about a gorilla supposedly caught near Yale, British Columbia in 1884. The story, titled "What is it?, A strange creature captured above Yale. A British Columbia Gorilla", appeared in the British Columbia newspaper the Daily Colonist on July 4, 1884. However, the "Jacko" story has been used by Bigfoot advocates as evidence for the existence of Sasquatch.
The following is from the must have book, "Know the Sasquatch/Bigfoot: Sequel & Update to Meet the Sasquatch" by Christopher L. Murphy. You can buy it here.
What Happened To Jacko?
The last we know of Jacko is that he was shipped in a cage to England to be used in a sideshow, but he apparently never arrived at that destination.
Across the continent, also in the year 1884, the Barnum & Bailey Circus presented in New York City Jo-Jo the Dog-Faced Boy, a sixteen-year-old youth covered in long hair. Jo-Jo, whose actual name was Fedor Jeftichew (b. 1868), was alleged to have been found in Russia along with his father, who was also covered in hair.
Jo-Jo has been coincidentally connected with Jacko. It has been reasoned that Jacko may have been purchased in the United States by circus man P.T. Barnum and billed for a sideshow, but died before he could be exhibited. Barnum thereupon quickly found a replacement—Jo-Jo. From what I have learned, circus advertising material created in 1884 showing a hairy creature does not appear to show Jo-Jo. This material was replaced with an ad showing an actual photograph of Jo-Jo taken in 1885.
You can purchase the book, "Know the Sasquatch/Bigfoot: Sequel & Update to Meet the Sasquatch" by Christopher L. Murphy here.