Birthdate determines mating strategy for spear squid
Scientists from The University of Tokyo have discovered that a male spear squid’s birthday is not just a date—rather, it determines their mating strategy for the rest of their lives.
According to their study, spear squid that are born early in the mating season (between early April and mid-July) grow to formidable sizes. Called "consorts", they actively fight off any rivals in order to mate and then stick close to their mate as she lays her eggs.