Every 50,000 years, all Horta die off expect one, which must repopulate the species through egg laying. Will kill to protect its young. Place on planet.
Most mothers are very protective of their young.
Such was the case on Janus VI in the 2260s. The skills needed to cure this dilemma are tough to muster, very tough in fact. Few personnel have either Leadership x2 or Exobiology x2, and only Vulcans have Mindmeld. I'm a Doctor, Not A Bricklayer . I'm a Doctor, Not a Bricklayer .