Eurypterids in the petting zoo? -- Eurypterids---the giant, scorpion-like arthropods of Ordovician to Devonian seas and lakes---may not have been the terrors of the waters that most have assumed. From FoxNews: Ancient 8-Foot Sea Scorpions Probably Were Pussycats. Some may have been vegetarians or scavengers, though the researchers acknowledge that species other than the ones …