Imagine a world where the boundaries between “fish” and “not-fish” blur, where the ancestors of birds and mammals once swam ...

A fossil analysis suggests that the yunnanozoan, a wormlike fish that flourished around 520 million years ago, sported structures that were the precursors of the head and jaws of modern vertebrates.

Osaka Metropolitan University researchers review the evidence for individual face recognition in fish and speculate that face identification neural networks are both similar and widespread across ...