The study of Astyanax mexicanus, encompassing both its cave-adapted and surface-dwelling forms, has emerged as a model for understanding evolutionary adaptation to extreme environments. Researchers ...

A tiny fossil fish from Alberta is forcing scientists to rethink a story that has sat quietly in textbooks for decades. It is ...

While prospecting in the barren fjords of Arctic Canada, a trio of paleontologists struck the evolutionary equivalent of gold. They uncovered three specimens of a 383-million-year-old creature midway ...

A study published in the Nature journal alters how the evolution of fish has been historically understood. Fossilized fish and other sea creatures have often been pivotal in new scientific discoveries ...

The deep sea, covering approximately 65% of Earth's surface, has long been considered a biological desert. In this extreme environment—particularly in the hadal zone at depths greater than 6,000 ...

A tiny desert fish survives in a sun-scorched cavern on the edge of extinction. Here’s how it’s offering scientists a rare glimpse into the extremes life can endure.

Editor's note: All opinions, columns and letters reflect the views of the individual writer and not necessarily those of the IDS or its staffers. We’ve all seen this poster in our middle school ...

A trade-off between tooth size and jaw mobility has restricted fish evolution, Nick Peoples at the University of California Davis, US, and colleagues report June 24 th in the open-access journal PLOS ...

Antarctic icefish are famous for living without red blood cells, but they are not alone. A species of needle-shaped, ...

PHILADELPHIA — The recent discovery above the Arctic Circle of remarkably well preserved fossils from a new species of ancient fish provides a key marker in the evolutionary transition of fish to ...

Digital reconstruction of tiny, 400-million-year-old jawless fish shows how traits for evading predators later gave rise to hunters A fossil the size of a fingernail is rewriting the opening chapter ...