Among these, one stands out not just for its size but for the mystery and awe it inspires: the world's biggest freshwater fish. This article takes you on an exploration of this remarkable creature ...

A properly dressed male guppy, with its gaudy blue spots and brilliant splashes of orange, can't help but stand out. But for a fish that spends its life swimming among predators, it seems that ...

We've seen in our simulations that the more brightly colored a male guppy is, the more likely he ... On the most basic level, the male with the biggest, brightest tail spot announces most loudly ...