The Blind Cave Tetra (Astyanax mexicanus) is a fascinating example of evolutionary adaptation. Native to freshwater rivers and caves in Mexico, this species exists in two forms: a surface-dwelling form with normal eyesight and pigmentation, and a cave-dwelling form that is blind and lacks pigmentation. The cave form is often referred to simply as the “Blind Cave Tetra.” Over generations, the cave-dwelling population has undergone significant changes due to life in complete darkness. One of the m