When the 18th-century biologist Carl Linnaeus classified a group of animals as “mammals,” he based the name on one key characteristic—mammary glands, from which females produce milk to feed their ...

The act of breast-feeding is so fundamental to being a mammal that we named ourselves after it. (“Mammalis” translates to “of the breasts.”) But over time, scientists have discovered that other ...

Millennials get a bad rap for living with their parents into adulthood, but maybe now jumping spiders will take the heat. Not only do they live at home until they’re nearly adults, but they nurse from ...

Nursing at the teat is generally seen as a mammalian trait – shared by humans, cows and cats alike – but it turns out spiders do it too. At least that’s the case with Toxeus Magnus, a type of jumping ...