On Fri, 4 Oct 1996, Allen Dick wrote: > > Fluvalinate is slightly toxic to birds. The acute oral LD50 > > for fluvalinate in bobwhite quail is > 2,510 mg/kg. > > If I got this right, it takes 2.510 kg *per kg of quail* to kill half the > quail(s?). ( if 1mg=.001kg) Allen was just a few orders of magnitude off. 1 g (gram)=0.001 kg (kilogram); a milligram (mg) is one-millionth of a kilogram. Another way of expressing mg/kg is as parts per million (ppm). Tom Culliney [log in to unmask]