A study recently published in the Proceedings of the Royal Society B (Biology), suggests that whales once swam in the Mediterranean Sea. Researchers from the Université de Montpelier used DNA barcoding and collagen fingerprinting to identity a collection of ancient whale bones from Roman and pre-Roman archaeological sites near the Strait of Gibraltar. The results indicated that the bones belonged to two species of whales: right whales and grey whales. Given the proximity to the Strait of Gibraltar, the researches believe that the Mediterranean Sea was once a calving ground for these whales. Furthermore, they conclude: "The evidence that these two coastal and highly accessible species were present along the shores of the Roman Empire raises the hypothesis that they may have formed the basis of a forgotten whaling industry" some 2000 years ago. Biblical critics have questioned where a fish big enough to swallow Jonah in the Mediterranean Sea came from. While the Bible never calls the fish that swallowed Jonah a whale – it simply describes it as a "great fish" – the new study is evidence that whales were once native to the Mediterranean Sea.