Friday, October 8, 2010
Bird's Eye View
The phrase "bird's eye view" is a common one, but what do birds really see? Looking down from above, this Lomaria looks out of the ordinary, when actually it's a dwarf tree fern with elegantly ruffled fronds. Scientists have long wondered how birds keep to their course during migration. One current theory is that with their ability to see ultraviolet light, they actually "see" the Earth's magnetic field and use it for compass orientation. Some believe they recalibrate their compass at twilight as the sun sets in the west.