Deep-sea creatures have several adaptations that allow them to survive in the extreme conditions of the deep ocean. Some common adaptations include bioluminescence for communication and camouflage, reduced eyesight due to the lack of light, pressure-resistant bodies to withstand high water pressure, and unique feeding mechanisms to catch prey in the darkness of the deep sea. Additionally, deep-sea creatures often have slow metabolisms to conserve energy in the food-scarce environment they inhabit.