Into a competitive world, guppies are born not just bigger, but more mature

Throughout nature, moms engage in a trade-off: Churn out a bevy of offspring and hope for the best, or have fewer kids but invest more in their survival. Trinidadian guppies provide a model example of this pervasive parenting poser, but a new study by Brown University researchers provides uniquely deep insight into how guppy moms equip their babies for the environment they'll face.