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Melania Trump kicked off inauguration day with an outfit that has all the hallmarks of her favoured First Lady style: sharply cut, with spiked heels and a dramatic flourish via the headgear.

"As we left the park, we were told to take off all our headgear. We were told everyone leaving from that exit could not be costumed."

After taking a punch to the face inside 30 seconds during Thursday's fight, Carini went to the corner for her coach to fix her headgear.

Other research has found significant differences in the headgear of dinosaurs within the same species.

Two different families — each sporting every imaginable combination of spikes, horns and frills — diversified across the landscape, using their headgear to signal mates and challenge rivals.