English: Fetus of dolphin showing in exquisite detail similarities between land mammals and modern cetaceans. The pelvic remnant is seen as a small blue bar below the tail, and the many bones of the forelimb match those of land mammals. The large brains of cetaceans are growing and not protected by bone at this stage. The fetal tissues were made transparent, cartilage was stained blue, and bone purple. Scale bar is 1 cm.
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