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Teen boy lifeguard blowing whistle with mouth and raised arms beside a canal bridge; vigilance duty.
Female cheetah staying vigilant in the bush, Mountain Zebra National Park, South Africa
Woman with curly hair and striped shirt stares and holds finger binoculars to eye in purple studio set; vigilance.
Woman in pink shirt points two fingers to eye on street near park benches and trees in daylight; vigilance.

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