How do zoos display nocturnal animals during daytime visiting hours?

Zoos successfully display nocturnal animals during daytime visiting hours by reversing the animals' normal cycle of daylight using artificial light.1

In these specialized exhibits, the building is illuminated with dim white or red light during the day, which encourages the animals to become active while visitors are present. Conversely, at nightfall, the houses are fully illuminated, signaling the animals to go to sleep. This manipulation of light cycles allows zoos to align the animals' active periods with public viewing hours.1