Rockville's answer to the wildebeest of the Serengeti have arrived again. In the last few weeks, the crows have started congregating around Randolph Road and White Flint Mall. It is quite a sight, and can be witnessed from any parking lot in the area, around dusk. Many thousands of crows all stream over, pretty much silently. (I've always wondered what the proportion of American/Fish is among these birds). Jim Jim Felley Smithsonian Institution irmss668@sivm.si.edu