The study of cavefish and surface fish, particularly the Mexican tetra (Astyanax mexicanus ... A study found that hybridization between cave and surface populations of A. mexicanus contributes ...
Researchers at the University of Bayreuth have now demonstrated this by examining the largest neuron in the brains of blind Mexican cavefish ... independently evolved cave-dwelling forms.
But, between one hundred and fifty and two hundred thousand years ago, some came to inhabit a more exotic environment: the underground pools of a system of caves. Over generations of darkness ...