Caribbean Hermit Crab, St. BartsHermit crabs have two sets of antennae they use for various sensory input. The inner antennae are shorter and used for taste and smell. In this image you can see the longer, outer antennae, known as feelers, which they use to navigate what’s in front of them. I photographed this Caribbean hermit crab, also known as a purple pincher on the Caribbean island of St. Barts. Nikon D500 with Nikkor 200-400mm lens (at 400mm) ISO 800, f/4 at 1/500th of a second.