These Ancient Killer Tadpole Babies Ate Each Other Before They Were Born! | Delphyodontos

Everyone knows that animals either lay eggs or give birth, but what most may not realize, is that these two options are far from the only options. On top of that, how did such a thing evolve? How can we know? One bizarre little tadpole-shaped fossil from the badlands of Montana provides some clues as to how babies were being born 300 million years ago.
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✅ RESEARCH ✅
Lund, R. 1980. Viviparity and intrauterine feeding in a new holocephalan fish from the Lower Carboniferous of Montana. Science, 209: 697‑699.

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