Something surprising is happening in our fair river: Conservationists have found seahorses among the muck in the Thames. More exciting, the seahorses are a rare short-snouted breed -- Hippocampus hippocampus, for you bio fiends out there -- that usually live around the Canary Islands and Italy. Seems like a long way to travel for a horse with no legs. The little creatures, which normally live in shallow muddy waters, estuaries or seagrass beds, have been......