Baby Chicks and Brotherhood
It's a mistake to think of evolution as producing selfish animals concerned only with their own survival. Altruism abounds in cases where a helping hand will encourage the survival of genetic material similar to one's own. Baby chicks practice this "kin selection" by making a special chirp while feeding. This call announces the food find to nearby chicks, who are probably close relations and so share many of the chick's genes. The key to natural selection isn't survival of the fittest animal. It's survival of the fittestgenetic material, and so brotherly behavior that favors close relations will thrive.
Mole-Rats aren't Blind
With their puny eyes and underground lifestyle, African mole-rats have long been considered the Mr. Magoos of rodents, detecting little light and, it has been suggested, using their eyes more for sensing changes in air currents than for actual vision. But findings of the past few years have shown that African mole-rats have a keen, if limited, sense of sight. And they don't like what they see, according to a report in the November 2006 Animal Behaviour. Light may suggest that a predator has broken into a tunnel, which could explain why subterranean diggers developed sight in the first place.
