Arguments are presented for a substantial, unexplored population of co
mets with radii less than 1 km. Known examples confirm this population
and extrapolation of any plausible size-distribution function indicat
es large numbers. However, their accurate numbers, orbital characteris
tics, and physical properties are unknown. Thus, even though the small
comets may be the most frequent cometary bodies impacting the planets
, a quantitative evaluation is not currently possible. We advocate an
optimized, dedicated search program to characterize this population.