Pepeijn Bruins, 13, was heartbroken when his pet rat Ratjetoe was put to sleep after suffering from cancer.
In an effort to cheer up the teen, Danish inventors Arjen Beltman and Bart Jansen stuffed the rat's body and attached it to three radio-controlled propellers that work via remote control.
The flying rodent became the world's first rat drone (video below).
Beltman and Jansen had previously created a flying dead cat and ostrich. They want to invent a flying shark, reports Yahoo! News.
"I loved him very much," Bruins told the Daily Mail. "He always liked to be cuddled and he would run up my clothes and hide. When I learned he had cancer and the vet had to put him to sleep I was very upset."
"I had seen Bart and Arjen and their flying cat, and I asked my dad if it would be possible to have the rat fly," added Bruins.
"When I heard the boy's rat had died of cancer, and how upset he was, I just knew I had to help," said Beltman. "Technically, it was very different to the cat, it has three rotors instead of four, and being a small rodent, it is extremely lightweight, so prone to being blown by the wind."
"Flight is man's greatest achievement, so why not give it to more animals? The world needs more flying animals," stated Jansen.
Jansen and Beltman's odd hobby will appear in a documentary entitled, "All Creatures Great and Stuffed."