Triskelion Triskelion A triskelion or triskele is a motif consisting of a triple spiral exhibiting rotational symmetry. The spiral design can be based on interlocking Archimedean spirals, or represent three bent human legs. Both terms are from Greek ("triskelion") or ("triskeles"), "three-legged", from prefix "τρι-" ("tri-"), "three times" + "σκέλος" ("skelos"), "leg". A triskelion is a traditional symbol of Sicily, where it is called "trinacria"; the Isle of Man, where it is known in Manx as "Tree Cassyn Vannin", and Brittany where it is known as "Triskèle". Ingushetia also has a (stylised) triskelion in its flag. The triskelion symbol appears in
Introduced species of the British Isles are susceptible. The grey squirrel is a carrier of the squirrel pox virus which kills red squirrels but not grey squirrels. The European crayfish is susceptible to crayfish plague which is spread by the introduced signal crayfish. Unlike some other environmental problems such as pollution, the effect of an introduced species is not a single event. Once a species has been introduced to an island, the problems may persist and escalate as the species spreads further. Coypus "(Myocastor coypus)", large semi-aquatic rodents native to South America, were introduced to the British Isles in 1929 when fur farms were set up