Whoever coined the phrase "they only come out at night" must have made a night dive or two.

The reef undergoes a kind of changing of the guard. The truly bizarre stuff emerges in the evening.

At dusk most of the daytime populace gives way to those late sleepers. Crabs, sea stars, shrimp, octopus, eels swimming along the top of the reef all materialize from the safety of their daytime holes to dine. And each often finds itself both predator and prey.

But many demonstrate clever adaptations to safeguard them from hungry predators. Here a decorator crab so well resembles the orange tube sponge that without the modeling of the flash, it would probably vanish into the sponge entirely.