![]() ![]() 1 To do this they look at the fossils that are preserved in sediment layers these sediment layers can be dated and let us leaf through the pages of the past. See the changes in the Levantine – the Eastern Mediterranean – where researchers have reconstructed the mass of mammals in the region going back more than one million years. We now have lots of evidence for this decline in mammal size from across the world. Venture down into Colossal Cave and explore its depths.Look at the size of mammals over human history and we see a clear trend: they’ve gotten smaller. It's creative - and, as Roberta says, it’s a fantastic design. It’s fun! It is also thought provoking and challenging.
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