I came across these 2 crabs in, perhaps, a mating process. The top crab was carrying the other one and scrambling across the sandy sea floor when I tried photographing them.
Big, colorful crab. I was with the son of the head marine biologist there, exploring the tide pools for little creatures, and we poked this crab with our sticks to observe its defensive reaction.
At night and low tide in pool on reef flat