Do you ever think about evolutionary history? How the concept of evolution came to be? No need to be familiar with the biological maxim "ontogeny recapitulates phylogeny" to enjoy any of these evolutionary humor gifts. Featuring embryonic stages of various organisms -- a diagram often falsely attributed to Ernest Haeckel. Includes the biology humor saying: "evolutionary history can be a bit repetitive". Make others do a double-take with any of these featuring the similarities amongst various embryos of different species!
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