Cats also use their Jacobson’s Organ for hunting, social interaction, sex and self-defense. Some research suggests humans have this organ, but if we do, the jury is out as to whether we use it.

Watch this tear-jerking clip of an abandoned baby zebra being rescued by a herd, and then read about zebra relationship dynamics.

Named after Ludvig Levin Jacobson, who studied this organ, the vomeronasal organ helps dogs understand chemical signals, or pheromones, given off by other dogs or animals.

Named after Ludvig Levin Jacobson, who studied this organ, the vomeronasal organ helps dogs understand chemical signals, or pheromones, given off by other dogs or animals.