|"'Feejee Mermaid' has become the generic term for the many fake mermaids that can be found around the world..."
This article contains information relating to a hoax. According to Cambridge dictionary a hoax is "a plan to deceive a large group of people; a trick."
The Giant Rooster is not a distinct species, but rather a mutant, oversized version of the common rooster. It's not clear what makes them so big and large. Maybe it's the food they eat, or something in the air. Maybe it's radiation. Whatever the reason, giant roosters have been a frequent subject of photographs from the beginning of the twentieth century onward. Many of these photographs have been sent as postcards.
During the drought years of the Great Depression Midwestern farmers seemed to enjoy sending postcards of giant roosters (and other giant-sized livestock and produce) to their friends and relatives back east. These postcards were frequently captioned: "They grow 'em big here!"
Like the Giant Grasshoppers, these are considered hoaxes.
The largest breed of real chicken is the Jersey Giant which is black in color, first bred in the early 1800s, and weighs over 15 pounds and 2 feet tall, they are used as egg and meat producers even though there are only about 10,000 around today.