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.
Lesser horseshoe bat this bat species for echolocation lie between 93–111 kHz, have most energy at 110 kHz and have an average duration of 31.7 ms. Due to the frequency of their echolocation calls there are overlaps with those of the Mediterranean horseshoe bat and Mehely's horseshoe bat. Lesser horseshoe bat The lesser horseshoe bat ("Rhinolophus hipposideros"), is a type of European bat related to but smaller than its cousin, the greater horseshoe bat. The species gets its name from its distinctive horseshoe-shaped nose. The lesser horseshoe bat is one of the world's smallest bats, weighing only 5 to 9 grams, with a