Caribbean Monk Seal
After an extensive search for the elusive Caribbean monk seal, which hadn’t been seen since before being placed on the endangered species list in 1967, it became the first seal to be declared extinct due to human intervention. Prior to its extinction, the seal suffered years of being hunted and killed in a relationship that is said to have started in 1494. Allegedly, during his second voyage, Christopher Columbus anchored off the island of Alta Velo, where crewmembers killed a group of eight seals. Since then, the seal were butchered for oil to the point where, by 1850, the numbers were too few for commercial hunting.