Thought I might as well state the other explanation, and at the same time correct the somewhat ill-informed notions of Monty and Spinchimp as to timescale. Firstly, it's true that the Bible doesn't specifically mention dinosaurs by name. It also doesn't mention wildebeest, ring-tailed lemurs, polar bears, kangaroos or ao thousand other animal species, for the simple reason that the Bible is not a natural-history textbook. But wherever it does touch on the contents of the natural world, what it states is demonstrably truthful and accurate. As for the dinosaurs, you really don't have to look far in any decent encyclopedia to discover that the whole of the prehistoric research community worldwide agreed a long time ago that, even according to their own very imperfect calculations of time lapse, the last of the dinosaurs disappeared from the earth at least 200 million years before the earliest evidence of human life...!! So, that means that strange ideas about the dinosaurs on board Noah's ark are, shall we say, a little misleading..?