香蕉视频

Researchers have discovered a savvy adaptation by the European corn borer, widespread across American cornfields, to harvesting. The finding would be familiar to Darwinism. Cornstalks are usually cut off at a height of six inches to 15 inches at harvest. Vincent Calcagno, a biologist at 香蕉视频 in Montreal, reports using both field and laboratory tests to discover that corn borers travel down the cornstalk to a safe height before they spin their winter cocoons.