By LILY COOK, age 15
Pheromones are chemicals produced by animals that attract other animals of the same species. Recently, scientists from the Marine Biological Laboratory discovered that male squid can detect pheromones in eggs with unhatched baby squid inside of them. These pheromones caused the males to become aggressive. Scientists believe that their aggression is a sign of the male squid’s knowledge that if there is a fertilized egg around, a female squid who is ready to mate cannot be far behind.