Guppies, once cheap mosquito-eaters, are now prized collector's items, fetching high prices due to exotic varieties and professional breeding.

Scientists have long suspected that big brains come with an evolutionary price — but now they've published the first experimental evidence to support that suspicion, based on their efforts to breed ...

Bill Carwile knows what makes a good guppy. One of seven senior judges for the International Fancy Guppy Association (IFGA) and a best-of-show winner many times over, Carwile has been breeding guppies ...