H. P. Lovecraft 
Horror at Martin’s Beach [EPUB ebook] 

When captain James P. Orne and his crew kill a strange and enormous animal in the sea, they are confused. They have never seen anything like this before – the animal looks like a giant sea monster. They start to make money by letting people see the corpse of the animal. Animal experts, however, tell them that the monster was actually only a baby. One day, the corpse disappears… and the animal will have its revenge. –