Ever wondered how scientists can tell the age of a horseshoe crab? During tagging surveys, biologists use physical characteristics to sort crabs into age categories. From shell wear to spine shape, each detail gives us clues about their life stage! These observations help us better understand population structure and support conservation of this ancient species. Spring and fall also mark horseshoe crab mating season, when you’re most likely to spot them along the shoreline during high tide, espe