May is horseshoe crab mating season and the greatest congregation of them in the world is in the Delaware Bay. Each high tide brings the crabs to shore where they lay their eggs. They peak during full moons but are also active during a new moon (which was the case when I took this photo). It also helped that dead high tide was just after sunset making it the perfect time to get slow exposure photos. They are actually not even crabs but more closely related to spiders and scorpions and are one of the oldest living creatures on earth, predating both dinosaurs and birds by about 150 million years.

www.seancrane.com