The Social Lives of AnimalsSome animal societies hold a mirror up to the human world: elephants hold funerals for departed family members. Pinyon jays run collective crches. Rats will go out of their way to help a cold, wet stranger. Other lifestyles can seem intensely alien. Take locusts, surging over the land in their millions, unable to slow down for a moment because the hungry ranks behind will literally bite their legs off if they don't stay one step ahead (actually, you