Hummingbird Feeders. Hummingbirds get the energy they need to maintain their astonishing metabolism primarily from flower nectar and the sugar water they find at feeders (here's the recipe). Think of them as miniature flycatchers, and sugar is just the fuel for getting their real nourishment.
afÂ·terÂ·imÂ·age. n. A visual image that persists after the visual stimulus causing it has ceased to act. Also called photogene. (ËÉËftÉrËÉªmÉªdÊ).
Visual Acuity Notation. Visual acuity is the ability to see and discriminate a certain size target at a specified distance. Distance vision can be measured by various methods, but basically looks like a fraction, e.g. 20/20, 20/200. The first figure (numerator) records the distance at which the testing was done (in feet).