How did animals go from swimming to walking--what changed about their bodies? Skates like this one use the same neurons to walk as land animals. Because skates are an evolutionarily ancient animal, that means the neurons essential for walking originated in species that separated from other four-legged vertebrates, or tetrapods, about 420 million years ago.
Learn more: http://www.sciencemag.org/news/2018/02/walking-fish-may-reveal-how-animals-first-took-land
Read the paper: http://www.cell.com/cell/fulltext/S0092-8674(18)30050-3
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L. Jung et al., Cell 2018