Koalas diet consists of mostly poisonous eucalyptus leaves. Babies aren't born with the immunity to the poison. Baby koalas eat their parents feces to slowing build up that immunity they need to eat the leaves by themselves
Baby Red Squirrel: The red squirrel or Eurasian red squirrel (Sciurus vulgaris) is a species of tree squirrel in the genus Sciurus common throughout Eurasia. The red squirrel is an arboreal, omnivorous rodent.