Marmosets appear to practice making their first cries before they are even born.
Research shows, for instance, that chicks inside their eggs are
Around 95 days into the pregnancy, a fetus’s face comes into view for the first time. The researchers observed that each young fetus moved its mouth and other parts of its face in tandem with its head. As the pregnancy progressed, the facial features and head began to move independently. The decoupling of these different motor regions presumably prepares the fetus for tasks like feeding or vocalizing.
Then it was a matter of reading lips. Was the fetus just moving its mouth, or were the movements mimicking particular sounds? It was clear to the researchers early on that the mouth movements were similar to the motions a marmoset makes during a contact call, distinct for its long duration and multiple syllables.
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