Video by @joelsartore | A male white-spotted boxfish at Pure Aquariums in Lincoln, Nebraska.
These fish can be found in the Indian and Pacific Oceans, near reefs as deep as 30 meters. They are sexually dimorphic, meaning males and females of this species are colored differently. The male in this case is more colorful. When startled or threatened, this fish can excrete toxins from their cells into the water, poisoning marine life in close range.
To see an image of a female boxfish, check out @joelsartore!