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Feeding:
First, the egg is checked out thoroughly with the tongue, then a yawning motion unhinges the jaws, and the swallowing of the egg begins. There are spike-like vertebral appendices (hypapophyses) protruding into the esophagus, which break the egg open through muscle contraction. After the egg contents have been swallowed, the eggshell is spat out. One could compare this with a car press where the squashed car reappears as a small compact parcel.
