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CROWS & RAVENSThe class of birds known scientifically as corvidae

includes crows, ravens, magpies, and jays. In each of these species, the brain to body ratio equals that of dolphins, and nearly matches our own. These are the brainiacs of the bird family, smarter than eagles, hawks, and owls.

• A scientist put an animal carcass out where ravens could find it, then broadcast over a loud-speaker the typical call a raven will give to alert others that it has found a source of food. Twenty seconds later, a single raven flew to the carcass, inspected it, and left. Two minutes later, 29 ravens were gathered around. They also flew off, but the next morning 40 ravens gathered around the car-cass and then they began to feed. Ravens prefer to feed in groups around carcasses to better protect them from coyotes and other carnivores that may also be feeding there.

• Ravens that have found a complete carcass are unable to open it to reach the meat. They have been known to go in search of wolves, coyotes, or even a person, guiding it back to the meat by circling and calling so that it can have a chance to eat scraps.

• Researchers watching crows drop snail shells on rocks to crack them open later determined that the height the crows dropped them from was ex-actly the height needed to crack them open. To drop them from a lesser distance would have meant wasted energy when they failed to open; to drop them from a greater height also wasted energy by extra flying and increased the chances the snail would roll into the water. The crows also dipped the snail into the water to wash away an-noying bits of shell that clung to the meat.

• One crow, unable to break open tasty acorns, solved the problem by dropping them on a street and waiting until a car ran over them.

• A crow was watching ice fishermen. It saw the men bait the hooks, drop the line into the hole in the ice, then wait until a signal flag bobbed, indi-cating a fish was on the line. Then they’d haul up the line and collect the fish. While the fishermen were occupied at other holes, the crow watched the flag bob at another hole. It tried to pull the line up by grasping it in its beak, but it couldn’t pull the line up far enough. So it pulled the line as far onto the ice as it could, then stood on it to keep it from slipping back into the water. It walked on the line back to the fishing hole, where it grasped the line in its beak once again and backed up. It did this over and over until the fish flopped out onto the ice.

• A crow being attacked by a falcon got away when it flew between two strands of barbed-wire fence. The falcon had a wider wing-span and was caught in the wire.

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