دنده های فسیلی اسرار جدیدی را در مورد تکنیک شنای ایکتیوسور فاش می کند

Fossil ribs reveal new secrets about ichthyosaur swimming technique

Ichthyosaurs ruled the oceans for 150 million years during the Mesozoic Era. Their fish-shaped bodies were built for high speeds. In that context, it is normally an advantage to be as light as possible.