Got milk? Of course you do; few things are as uniquely mammalian as our milky infancies. Sure, we’ve all got backbones (but so do lizards), warm blood (but so do birds), and hair (but so do plants) – but it’s the mammary glands from which mothers nurse their young that really set us mammals apart from the rest of the Tree of Life.
That’s why it was a little shocking when researchers announced today that another species was found to provide milk to its young. The newest member of the milk-producing family … is a spider.
