What is a betta fish? Betta fish—also known as Siamese fighting fish—are among the oldest species of domesticated fish. Their scientific name, Betta splendens, combines two languages ...

But as we know, certain fish in the Colorado and San Juan River Basins are endangered. Fighting to survive, you might say.

The new findings, which show their brains cooperating at the molecular level, helps explain how the fish synchronize their fighting behavior, which appears more closely choreographed the longer the ...