A remarkable new study published in the journal eLife reveals that marmosets begin practicing vocalizations to call for their parents before they are even born. The researchers found that baby marmosets practice the mouth movements needed to call out to their family while they are still in the womb.  According to the experts, the findings may also apply to humans, as ultrasounds have shown developing babies making mouth movements that are used for crying during the third trimester of pregnancy. "Human and non-human primates produce rhythmical sounds...