…despite the putrid menu vultures favor, their excrement is sterile. In fact, letting the waste run down their legs can clean off germs from the gore; it’s their version of freshening up with a moist towelette after a barbecue. Tiny bee hummingbirds are so small you could mail 16 of them for the price of a single stamp. Robins can navigate with the right eye alone, but not the left. Albatrosses, who spend 95 percent of their lives over open ocean, are thought to be able to shut down half their brains while continuing to fly at 40 m.p.h. For blackcap warblers, the direction of migration is clearly innate, so crossbreeding a group of blackcaps who flew south for fall migration with a group that oriented westward resulted in offspring who flew in a southwesterly direction.