The cas of Gef the Talking Mongoose take place in Scotland in the 1930's.  Gef is widely believed to be a hoax despite and entire family claiming his validity until the days they died. 

Sources :

The Bizarre, True Story of Gef the Talking Mongoose - Atlas Obscura, www.atlasobscura.com/articles/gef-the-talking-mongoose-true-story-nandor-fodor. Accessed 20 Oct. 2025. 
Contributors to Cryptids and Myths Wiki. “GEF.” Cryptids and Myths Wiki, Fandom, Inc., allcryptid.fandom.com/wiki/Gef. Accessed 20 Oct. 2025. 
“The Haunting of Cashen’s Gap.” The Haunting of Cashen’s Gap, www.isle-of-man.com/manxnotebook/fulltext/hc1936/index.htm. Accessed 20 Oct. 2025. 
Quackenbush, Thomm. “Voirrey Irving and the Talking Mongoose (1/2).” Voirrey Irving and the Talking Mongoose (1/2) - Thomm Quackenbush, thommquackenbush.com/20210215-gef.php. Accessed 20 Oct. 2025. 
“Why Gef the Mongoose, The Dalby Spook, Will Remain a Mystery.” Spooky Isles, 5 Nov. 2023, www.spookyisles.com/gef-the-mongoose-dalby-spook.