Guppies are beginner-friendly, low-maintenance fish that thrive in a 10-gallon tank, with a peaceful temperament and omnivorous diet. Males are smaller with vibrant colors, while females are larger ...

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 ...

In a Swedish lab, Alexander Kotrschal has deliberately moulded the intelligence of small fish called guppies. From a starting population, he picked individuals with either unusually large or small ...

Conservation Biology, Vol. 21, No. 6 (Dec., 2007), pp. 1573-1583 (11 pages) Ex situ conservation is of increasing importance to prevent the extinction of endangered animals in the wild. Despite low ...