Horseshoe to the modern hoof boot. Historians differ on the origin of the horseshoe. Because iron was a valuable commodity, and any worn out items were generally reforged and reused, it is difficult to locate clear archaeological evidence. Although some credit the Druids, there is no hard evidence to support this claim. In 1897 four bronze horseshoes with what are apparently nail holes were found in an Etruscan tomb dated around 400 B.C. The assertion by some historians that the Romans invented the "mule shoes" sometime after 100 BC is supported by a reference by Catullus who died in 54 BC.
Mangrove horseshoe crab The blood contains a chemical called "Limulus" amoebocyte lysate (LAL) that can be used to detect pathogens and their endotoxins. Mangrove horseshoe crab The mangrove horseshoe crab ("Carcinoscorpius rotundicauda"), also known as the round-tailed horseshoe crab, is a chelicerate arthropod found in tropical marine and brackish waters in India, Bangladesh, Indonesia, Malaysia, Singapore, Thailand, Cambodia, Vietnam, China and Hong Kong. It may also occurs in Sri Lanka, Myanmar and the Philippines, but confirmed records are lacking. Despite their name, horseshoe crabs are more closely related to spiders and scorpions (all are in the subphylum Chelicerata) than to crabs. The mangrove